Rheem Air Conditioner Error Codes — Meanings, Causes & Repair in Greater Vancouver

Seeing a fault code on your Rheem air conditioner? This guide explains what the most common Rheem air conditioner error codes mean, what’s safe to check yourself, and when to call HeatLand’s licensed HVAC technicians for Rheem air conditioner repair across Metro Vancouver and the Fraser Valley.

The codes below apply across common Rheem models (EcoNet, Prestige, Classic). Meanings follow Rheem’s documented fault codes — always confirm against your unit’s own manual, because exact wording can vary by model, control board and firmware.

How to read Rheem air conditioner error codes

Rheem (and the identical sister brand Ruud) EcoNet communicating/inverter systems report faults two ways. (1) On the EcoNet Control Center / EcoNet smart thermostat, faults appear under Service window > Current Faults (or Fault History) as alphanumeric EcoNet codes that are time- and date-stamped. On variable-speed inverter outdoor units the code is generated by the VSODU (Variable Speed Outdoor Unit Control board) and uses the form A###_O or T###_O, where the trailing _O = Outdoor; A-prefix codes are typically active/locked-out alarms and T-prefix codes are transient/temporary faults (some also show a short numeric code such as '31' on the VSODU display). The inverter drive (EV2) also shows a Yellow or Red LED flash count for the same fault (e.g. DC Bus Undervoltage = Yellow 8 Flashes). (2) On two-stage and single-stage EcoNet condensers the ICC (Integrated Comfort Control) board reports numeric/lettered Diagnostic Codes (e.g. 02, 21, 29, 30, L21) on its 7-segment display, and on inverter units a dual 7-segment LED shows grouped codes L8/L15/L16/L17. To clear stored/locked-out faults, disconnect power to the indoor and outdoor units for one minute. IMPORTANT: basic single-stage Rheem/Ruud air conditioners (non-communicating Classic-series condensers without an ICC board) have NO digital fault-code display at all – they show only a hard-wired status LED, if anything, and are diagnosed by gauges and meters. Codes below are transcribed from the official Rheem 'EcoNet and Flash Codes – Inverter Product' VSODU service document and the Rheem EcoNet RP2024 / EcoNet R-410A installation manuals (ICC Diagnostic Codes).

Rheem air conditioner error codes & what they mean

These are the Rheem air conditioner codes our Greater Vancouver technicians see most. Anything marked pro repair involves electrical, refrigerant, sensor or control-board work that must be done by a licensed HVAC technician — never open the indoor/outdoor unit or refrigerant lines yourself.

Code	What it usually means	Common causes	Safe to check yourself
T905_O	Inverter Fault – DC Bus Undervoltage. The inverter drive's DC bus voltage has dropped below acceptable level (incoming voltage below 187 VAC / DC bus below 175 VDC); compressor stops while the indoor air handler may keep running. EV2 drive LED: Yellow 8 Flashes pro repair	Low incoming line voltage to the drive (below 187 VAC); Power flicker or brownout during storms (often self-resets when voltage returns); Utility supply or feeder/wiring voltage-drop problem to the outdoor unit	Confirm the outdoor disconnect and the air conditioner breaker are both ON; If there has been a recent storm, power flicker, or brownout, try one power cycle: turn the AC breaker off, wait one minute, turn it back on, and wait several minutes; Set the thermostat to Cool with the setpoint below room temperature
T904_O	Inverter Fault – DC Bus Overvoltage. Line/DC bus voltage to the inverter drive exceeds the maximum allowable (incoming above 285 VAC / DC bus above 385 VDC). EV2 drive LED: Yellow 7 Flashes. Resets when voltage returns to range pro repair	High incoming line voltage to the equipment/drive (above 285 VAC); Utility over-voltage condition; Defective inverter drive	Confirm the breaker and outdoor disconnect are ON; Try one power cycle of the air conditioner at the breaker and wait several minutes
A906_O	Inverter Fault – AC Input Overvoltage. Incoming AC supply voltage measured at the drive is greater than 275 VAC pro repair	High utility supply voltage at the outdoor unit (above 275 VAC measured L1 to L2); Incorrect supply transformer tap or wiring	Try one power cycle of the air conditioner at the breaker and wait several minutes; Confirm the thermostat is set to Cool below room temperature
A907_O	Inverter Fault – AC Input Undervoltage. Incoming AC supply voltage measured at the drive is less than 170 VAC. EV2 drive LED: Yellow 9 Flashes pro repair	Low utility supply voltage at the outdoor unit (below 170 VAC measured L1 to L2); Voltage drop from undersized or loose feeder wiring; Brownout condition	Confirm the breaker and outdoor disconnect are ON; If there was a brownout or storm, try one power cycle at the breaker and wait several minutes
T901_O	Inverter Fault – Compressor Overcurrent. The inverter detected the compressor pulling more current than allowed. The VSODU shows '31' at the time of the fault and the unit returns to operation after a time delay. EV2 drive LED: Yellow 1 or 3 Flashes, or Red 4 Flashes pro repair	Compressor shorted to ground or damaged compressor windings; Damaged wiring or molded plug to the compressor (U, V, W not secure); Defective inverter drive	Try one power cycle of the air conditioner at the breaker and wait several minutes for the unit to retry; Confirm the thermostat is set to Cool below room temperature
T902_O	Inverter Fault – Envelope Protection. Compressor current is outside the predetermined operating envelope for the commanded RPM. Must occur 15 times in a 24-hour period to be logged in the control-center fault history pro repair	Refrigerant overcharge (most common); Operating conditions outside the compressor envelope; Restricted airflow or abnormal system pressures	Check that the outdoor condenser coil is not blocked by leaves, grass, or debris and that there is clear airflow around the unit; Check and replace a dirty indoor air filter; Try one power cycle at the breaker and wait several minutes
T903_O	Inverter Fault – PFC Overcurrent. The Power Factor Correction (PFC) module inside the drive is detecting high current internally. (Service action: replace drive.) pro repair	Internal Power Factor Correction circuit overcurrent in the inverter drive; Defective inverter drive	Try one power cycle of the air conditioner at the breaker and wait several minutes
T908_O	Inverter Fault – PIM Over-temp. The Power Inverter Module (PIM) on the drive is overheated; the drive may stop or fold back (reduce) compressor RPM to protect itself. EV2 drive LED: Yellow 4 or 18 Flashes pro repair	Outdoor fan not operating correctly; Dirty/blocked condenser coil reducing heat rejection; Restricted drive heat-sink airflow or debris on the heat sink	Make sure the outdoor unit has clear airflow and the condenser coil is free of leaves, grass clippings, and debris; Confirm the outdoor fan area is unobstructed; Try one power cycle at the breaker and wait several minutes
T909_O	Inverter Fault – PFC Over-temp. The Power Factor Correction (PFC) section of the drive is overheated; the drive may stop or fold back compressor RPM. EV2 drive LED: Yellow 5 or 19 Flashes pro repair	Outdoor fan not operating correctly; Dirty/blocked condenser coil; Restricted drive heat-sink airflow	Make sure the outdoor unit has clear airflow and the condenser coil is clean; Try one power cycle at the breaker and wait several minutes
A910_O	Inverter Fault – Lost Rotor Position. The compressor rotor speed (measured via back-EMF) is not matching the commanded speed. EV2 drive LED: Yellow 2 Flashes pro repair	Loose or incorrect compressor connections at U, V, W and the molded plug; System grossly overcharged; Compressor mechanically tight or locked	Try one power cycle of the air conditioner at the breaker and wait several minutes; Confirm the thermostat is set to Cool below room temperature
T911_O	Inverter Fault – Current Imbalance. The drive detected significant compressor current imbalance between phases. EV2 drive LED: Red 14 Flashes pro repair	Loose or incorrect compressor connections at U, V, W and molded plug; Significant differences in compressor winding resistance (failing compressor)	Try one power cycle at the breaker and wait several minutes
A912_O	Inverter Fault – Micro Fault. The microprocessor on the drive has faulted. (Service action: hard reset of the drive; replace drive if reset fails.) EV2 drive LED: Red 13 Flashes pro repair	Inverter drive microprocessor fault; Defective inverter drive	Try one power cycle (hard reset) of the air conditioner at the breaker, wait one minute, then restore power and wait several minutes
A913_O	Inverter Fault – PIM Sensor Open. The Power Inverter Module temperature sensor on the drive is open. (Service action: replace drive.) EV2 drive LED: Red 2 Flashes pro repair	Open Power Inverter Module temperature sensor inside the inverter drive; Defective inverter drive	Try one power cycle at the breaker and wait several minutes
T914_O	Inverter Fault – DC Voltage Low. The drive's DC bus voltage is running low (normally 325 to 380 VDC). EV2 drive LED: Yellow 17 Flashes pro repair	Low incoming line voltage at L1 to L2; Defective Power Inverter Module on the drive	Confirm the breaker and outdoor disconnect are ON; Try one power cycle at the breaker and wait several minutes
T915_O	Inverter Fault – Discharge Temp. Compressor discharge temperature has exceeded 225 degrees F; the compressor may fold back (slow down) until temperature is below 200 degrees F. EV2 drive LED: Yellow 6 Flashes pro repair	Low refrigerant charge / abnormal operating superheat; Reversing valve leaking from discharge to suction (heat pump models); Loose or failing discharge line temperature (DLT) sensor connection to the drive	Make sure the outdoor coil is clean and airflow is unobstructed; Check and replace a dirty indoor air filter; Try one power cycle at the breaker and wait several minutes
A919_O	Inverter Fault – PFC/DSP Comm Fault. The drive lost internal communication between the PFC and DSP sections. (Service action: check ModBus cable, hard reset; replace drive if it persists.) EV2 drive LED: Red 9 Flashes pro repair	Internal drive communication loss between PFC and DSP; Loose/damaged internal ModBus cable; Defective inverter drive	Try one power cycle (hard reset) at the breaker, wait one minute, restore power, and wait several minutes
A920_O	Inverter Fault – COM/DSP Comm Fault. The drive lost internal communication between its communication and DSP sections. (Service action: check ModBus cable, hard reset; replace drive if it persists.) EV2 drive LED: Red 8 Flashes pro repair	Internal drive communication loss; Loose/damaged internal ModBus cable; Defective inverter drive	Try one power cycle (hard reset) at the breaker, wait one minute, restore power, and wait several minutes
A921_O	Inverter Fault – PFC Temp Sensor Open. The PFC temperature sensor on the drive is reading either low or open. EV2 drive LED: Red 1 Flash pro repair	Open or out-of-range PFC temperature sensor in the drive; Restricted airflow over the drive heat sink; Defective inverter drive	Make sure airflow over the outdoor unit and drive is not blocked by debris; Try one power cycle at the breaker and wait several minutes
T922_O	Inverter Fault – PIM Temp Foldback. The drive has folded back (reduced compressor speed) as a result of high PFC/PIM temperature. EV2 drive LED: Yellow 21 Flashes pro repair	Restricted airflow over the drive heat sink (debris/obstruction); Dirty condenser coil or outdoor fan issue; High outdoor ambient temperature	Make sure the outdoor unit and heat sink have clear airflow and the coil is free of debris; Try one power cycle at the breaker and wait several minutes
A925_O	Inverter Fault – Compressor Model Unknown. The inverter drive's size/model data card does not match (the drive is not programmed for the installed compressor). On the dual 7-segment ICC display this group shows as L8. EV2 drive LED: Yellow 22 Flashes pro repair	Incorrect memory/model data card installed; Incorrect inverter drive installed for the compressor; Loose or defective model data card	Try one power cycle at the breaker and wait several minutes
A927_O	Inverter Fault – DLT Sensor Open. The Discharge Line Temperature (DLT) sensor is open. EV2 drive LED: Red 3 Flashes pro repair	Open discharge-line temperature sensor or damaged sensor wiring; Loose DLT sensor connection to the drive	Try one power cycle at the breaker and wait several minutes
A928_O	Locked. Indicates the system is locked out and needs to be reset. Check the fault history at the control center for the underlying cause of the lockout, then address that fault pro repair	A protective fault tripped repeatedly and the system locked out; Underlying fault recorded in EcoNet fault history must be identified and corrected	Note any other fault shown in the EcoNet fault history; Try one reset: disconnect power to the indoor and outdoor units for one minute, then restore power and wait several minutes
A929_O	240VAC Missing or Comm Failure (formerly 'Comm Failure'). The drive is either not powered, or there is a problem with the ModBus cable between the VSODU and the drive. EV2 drive LED: Red 11 Flashes pro repair	Line voltage (240VAC) not reaching the drive at L1-L2; Faulty/loose ModBus cable or bent connector pins between the VSODU and the drive; Defective inverter drive	Confirm the outdoor disconnect and the AC breaker are both ON; Try one power cycle (hard reset) at the breaker, wait one minute, restore power, and wait several minutes
A900_O	Inverter Fault – Identity Fault. The inverter drive itself is not programmed; it is not field-serviceable. This fault should not normally occur in the field. (Service action: replace drive.) pro repair	Unprogrammed or factory-faulted inverter drive (not field-serviceable)	Try one power cycle at the breaker and wait several minutes
A950_O	Configuration Data Restore Failure. The firmware in the VSODU control board is corrupt. (Service action: replace/reflash VSODU firmware.) pro repair	Corrupt VSODU firmware; Failed VSODU outdoor control board	Try one power cycle at the breaker and wait several minutes
A951_O	Memory Card Data Write Failure. The VSODU is unable to write data to the memory card pro repair	Damaged solder joints on the back of the memory card socket on the VSODU; Failed VSODU control board; Failed memory card	Try one power cycle at the breaker and wait several minutes
T952_O	Outside Temperature Thermistor Failure. The outdoor temperature thermistor is reading Open, Shorted, or Low pro repair	Open/shorted outdoor temperature thermistor; Pinched or damaged sensor leads; Loose sensor connection at the VSODU	Try one power cycle at the breaker and wait several minutes
A953_O	Coil Temperature Thermistor Failure (formerly Evap Temperature Thermistor). The coil temperature thermistor is Open, Shorted, or Low. The unit will run in cooling mode but will not run in heating mode (heat-pump models) pro repair	Open/shorted coil temperature thermistor; Pinched or damaged sensor leads; Loose sensor connection at the VSODU	Try one power cycle at the breaker and wait several minutes
A954_O	Suction Temperature Thermistor Failure. The suction thermistor is Open, Shorted, or Low. The unit will run in cooling mode but will not run in heating mode (heat-pump models) pro repair	Open/shorted suction temperature thermistor; Pinched or damaged sensor leads; Loose sensor connection at the VSODU	Try one power cycle at the breaker and wait several minutes
T955_O	Compressor Temperature Thermistor Failure. The compressor (suction) thermistor is Open, Shorted, or Low; compressor stator heat will not operate pro repair	Open/shorted compressor temperature thermistor; Pinched or damaged sensor leads; Loose sensor connection at the VSODU	Try one power cycle at the breaker and wait several minutes
A956_O	Suction Pressure Sensor Failure. The suction pressure transducer is shorted, grounded, open, or reading outside the acceptable range pro repair	Failed or out-of-range suction pressure transducer; Loose transducer connection at the VSODU	Try one power cycle at the breaker and wait several minutes
T957_O	Low Refrigerant Pressure. Pressure at the transducer has fallen below the setting (below 50 PSIG in Cooling, 15 PSIG in Heating) pro repair	Low refrigerant charge / refrigerant leak; Restriction in the liquid or suction line, filter-drier, or strainer; Restricted airflow	Check and replace a dirty indoor air filter; Make sure the outdoor coil is clean and airflow is unobstructed; Try one power cycle at the breaker and wait several minutes
A957_O	Low Refrigerant Pressure (locked out). The system has tripped the low-pressure threshold 3 times in one call; the unit is locked out for one hour pro repair	Low refrigerant charge / refrigerant leak; Restriction in the liquid or suction line, filter-drier, or strainer; Repeated low-pressure trips	Check and replace a dirty indoor air filter; Make sure the outdoor coil is clean and airflow is unobstructed; The unit may resume on its own after the one-hour lockout; if it keeps locking out, service is required
T958_O	High Refrigerant Pressure. The system high-pressure switch has opened. EV2 drive LED: Yellow 20 Flashes pro repair	Dirty or blocked outdoor condenser coil; Outdoor fan not running; Refrigerant overcharge	Make sure the outdoor unit has clear airflow and the condenser coil is free of leaves, grass, and debris; Check and replace a dirty indoor air filter; Confirm the outdoor fan area is unobstructed
A958_O	High Refrigerant Pressure (locked out). The system high-pressure switch has opened 3 times and is locked out for one hour. EV2 drive LED: Yellow 20 Flashes pro repair	Dirty or blocked outdoor condenser coil; Outdoor fan not running; Refrigerant overcharge	Make sure the outdoor unit has clear airflow and the condenser coil is clean; Check and replace a dirty indoor air filter; The unit may resume after the one-hour lockout; if it keeps locking out, service is required
T959_O	Compressor Heater On (normal operation). A status flag shown only at the control center; the crankcase/compressor heater is energized. Often related to short cycling from envelope protection or pressure-switch trips, or to an overcharge condition DIY-checkable	Normal compressor-heater operation (informational); Frequent short cycling due to envelope protection or pressure trips; Refrigerant overcharge	This is typically an informational/normal status; no homeowner action needed unless accompanied by other faults; If cooling performance is poor, check and replace a dirty filter and make sure the outdoor coil is clean
T960_O	Compressor Lube Protection. Compressor temperature fell below the saturated refrigerant pressure, indicating liquid refrigerant may be returning to the compressor. Can happen in extreme cold when the compressor slows from overdrive pro repair	Liquid refrigerant flooding back to the compressor; Refrigerant charge issue; Operation in extreme cold ambient (heat-pump models)	Try one power cycle at the breaker and wait several minutes; If it persists, service is required
T961_O	Compressor Discharge Temperature High. The compressor is folding back (slowing down) due to high discharge temperature. When discharge temperature exceeds 225 degrees F the compressor slows to bring it below 200 degrees F. EV2 drive LED: Yellow 6 Flashes pro repair	Low refrigerant charge / abnormal superheat; Reversing valve leaking from discharge to suction (heat-pump models); Restricted airflow	Make sure the outdoor coil is clean and airflow is unobstructed; Check and replace a dirty indoor air filter; Try one power cycle at the breaker and wait several minutes
L8 / L15 / L16 / L17 (inverter group codes)	Grouped inverter-fault codes shown on the inverter outdoor unit's dual 7-segment LED display. L8 = Compressor Model Unknown / Inverter Identity Fault (model data card not connected or defective). L15 = Inverter Fault group (covers drive faults such as compressor overcurrent, DC bus over/under voltage, AC input over/under voltage, PIM/PFC over-temp, lost rotor, current imbalance, low DC voltage). L16 = Inverter Fault group (covers micro fault, PIM sensor open, PFC/COM comm faults, PFC temp sensor open, 240VAC missing/comm failure). L17 = Discharge Line Temperature Inverter Fault. These correspond to the A###_O / T###_O EcoNet codes listed above; read the EcoNet Control Center fault history for the specific code pro repair	Underlying inverter drive, voltage, sensor, or compressor fault – identify the specific A###_O / T###_O code at the EcoNet Control Center; Incorrect or loose model data card (L8); Out-of-range supply voltage, restricted airflow, or sensor/wiring fault depending on the group	Confirm the breaker and outdoor disconnect are ON; Make sure the outdoor coil and heat-sink airflow are not blocked by debris; Try one power cycle at the breaker and wait several minutes
02	High Pressure (ICC two-stage/single-stage condenser diagnostic). The integrated control detected an abnormal high-side pressure condition pro repair	Dirty or blocked outdoor condenser coil; Outdoor fan not running; Dirty indoor coil or restricted indoor airflow	Make sure the outdoor unit has clear airflow and the condenser coil is free of leaves, grass, and debris; Check and replace a dirty indoor air filter; Try one power cycle at the breaker and wait several minutes
21	Low Pressure Control Open (ICC diagnostic). The low-pressure control has opened pro repair	Low refrigerant charge / refrigerant leak; Frozen indoor coil; Dirty coil or air filter restricting airflow	Check and replace a dirty indoor air filter; Make sure supply/return vents are open and unobstructed; Set the thermostat to Cool below room temperature and allow any ice to thaw with the fan running
L21	Active Protection – Low Pressure Control Trip / Lockout (ICC diagnostic, flashing). The low-pressure control has opened 3 times in the same cooling operation and the control has locked out the compressor pro repair	Repeated low-pressure trips from low refrigerant charge / leak; Restricted airflow (dirty filter/coil) or frozen coil; Indoor blower not running	Check and replace a dirty indoor air filter; Make sure return/supply registers are open; Try one reset: disconnect power to the indoor and outdoor units for one minute, then restore power; if it locks out again, service is required
29	High Pressure Control Open (ICC diagnostic). The integrated control detected the high-pressure control is open pro repair	Dirty outdoor coil; Outdoor fan not running; Dirty indoor coil/filter or restricted indoor airflow	Make sure the outdoor coil is clean and has clear airflow; Check and replace a dirty indoor air filter; Try one power cycle at the breaker and wait several minutes
L29	Active Protection – High Pressure Control Trip / Lockout (ICC diagnostic, flashing). The high-pressure control has opened 3 times and the control has locked out the compressor for protection pro repair	Repeated high-pressure trips; Dirty outdoor coil or non-running outdoor fan; Restricted indoor airflow	Make sure the outdoor coil is clean and airflow is unobstructed; Check and replace a dirty indoor air filter; Try one reset: disconnect power to indoor and outdoor units for one minute, then restore power; if it locks out again, service is required
30	Fuse Open (ICC diagnostic). The 3-amp fuse on the ICC board is open, or low-voltage wiring is damaged/shorted pro repair	Blown 3-amp fuse on the ICC board; Shorted or damaged low-voltage (24V) control wiring; A short in a downstream low-voltage component	Confirm the thermostat is set to Cool below room temperature; Try one power cycle at the breaker and wait several minutes (do NOT open the unit or replace the fuse yourself – that requires a technician)

Rheem air conditioner codes we get called for most

T905_O — Inverter Fault – DC Bus Undervoltage. The inverter drive's DC bus voltage has dropped below acceptable level (incoming voltage below 187 VAC / DC bus below 175 VDC); compressor stops while the indoor air handler may keep running. EV2 drive LED: Yellow 8 Flashes

Typical causes include low incoming line voltage to the drive (below 187 vac); power flicker or brownout during storms (often self-resets when voltage returns); utility supply or feeder/wiring voltage-drop problem to the outdoor unit. A few things are safe to check yourself (Confirm the outdoor disconnect and the air conditioner breaker are both ON; If there has been a recent storm, power flicker, or brownout, try one power cycle: turn the AC breaker off, wait one minute, turn it back on, and wait several minutes), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes T905_O on Rheem air conditioners throughout Greater Vancouver.

A913_O — Inverter Fault – PIM Sensor Open. The Power Inverter Module temperature sensor on the drive is open. (Service action: replace drive.) EV2 drive LED: Red 2 Flashes

Typical causes include open power inverter module temperature sensor inside the inverter drive; defective inverter drive. A few things are safe to check yourself (Try one power cycle at the breaker and wait several minutes), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes A913_O on Rheem air conditioners throughout Greater Vancouver.

A956_O — Suction Pressure Sensor Failure. The suction pressure transducer is shorted, grounded, open, or reading outside the acceptable range

Typical causes include failed or out-of-range suction pressure transducer; loose transducer connection at the vsodu. A few things are safe to check yourself (Try one power cycle at the breaker and wait several minutes), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes A956_O on Rheem air conditioners throughout Greater Vancouver.

Is it safe to keep running a Rheem air conditioner with a fault code?

Most Rheem fault codes put the air conditioner into a safe lockout for a reason. You can safely check the basics — the power and breaker on, the air filter clean, the outdoor condenser clear of debris, and the thermostat set to cool — and restart it once. If the code returns, stop and book a technician. Air-conditioner faults are electrical and refrigerant issues — never open the unit or touch the wiring or refrigerant lines yourself.

Rheem air conditioner repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Rheem air conditioners — sensor and thermistor errors, communication faults, fan and compressor problems, refrigerant and pressure faults, and control-board issues — including units we didn’t install. We’re brand-agnostic, carry common parts, and give you an honest repair-or-replace assessment with upfront pricing and a free estimate. If your air conditioner is beyond economical repair, we’ll show you right-sized, high-efficiency replacement options and the rebates available.

Need it sorted fast? We offer priority emergency air conditioner repair. Explore Air Conditioner services, browse all air conditioner error codes by brand, or request a free estimate.

Rheem air conditioner service areas

We repair Rheem air conditioners across Greater Vancouver and the Fraser Valley, including:

Rheem air conditioner error code FAQs

Can I reset my Rheem air conditioner myself?

Yes — power-cycling the unit at the breaker once is generally safe after you’ve checked the basics (the power and breaker on, the air filter clean, the outdoor condenser clear of debris, and the thermostat set to cool). If the air conditioner faults again right away, stop and note the code — repeatedly resetting a air conditioner that keeps locking out can mask a real problem. Call a licensed HVAC technician to diagnose it.

What does the Rheem T905_O code mean?

On Rheem air conditioners, T905_O commonly indicates inverter fault – dc bus undervoltage. the inverter drive's dc bus voltage has dropped below acceptable level (incoming voltage below 187 vac / dc bus below 175 vdc); compressor stops while the indoor air handler may keep running. ev2 drive led: yellow 8 flashes. Confirm the exact meaning against your unit’s manual — codes can vary by model and series — and have the repair done by a licensed HVAC technician. HeatLand fixes this across Greater Vancouver.

Do you repair Rheem air conditioners you didn’t install?

Yes. HeatLand is brand-agnostic and services Rheem air conditioners throughout Metro Vancouver and the Fraser Valley, whether or not we installed the unit. We carry common parts and give you an honest repair-or-replace assessment.

Is a Rheem air conditioner fault code an emergency?

No heat in cold weather or no cooling in a heat wave is worth treating urgently. For priority air conditioner repair across Greater Vancouver, call (604) 330-3812.

How much does Rheem air conditioner repair cost in Vancouver?

It depends on the fault. Many Rheem codes point to sensors, thermistors, capacitors or control parts — usually far cheaper than replacement. We give upfront pricing and a free estimate before any work.

More Air Conditioner error-code guides

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