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

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

The codes below apply across common Goodman models (ComfortNet, standard). Meanings follow Goodman’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 Goodman air conditioner error codes

Standard single-stage Goodman ACs have NO on-unit fault display; the contactor simply energizes or not, and most diagnostics appear on the indoor air-handler/furnace control board. Communicating variable-speed inverter ACs (ComfortNet-compatible GVXC/GVZC family) show a 7-segment LED diagnostic code on the control board AND scroll a plain-language fault message on the ComfortNet / CTK04 communicating thermostat (Climate Talk message). Outdoor inverter faults use E-codes (e.g. E13, E24, E51); indoor air-handler faults use 2-character 7-segment codes (e.g. E5, b0, b9, d0). Stored faults are retrieved via the FAULT RECALL button on the board (last 6 faults) or the thermostat Equipment Status / Diagnostics screen.

Goodman air conditioner error codes & what they mean

These are the Goodman 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
E5 (indoor board) / E_E5 BLOWN FUSE	Fuse open on the indoor air-handler control board (24V control fuse blown) pro repair	Blown control-board fuse (F1U); Short in 24V control wiring; Open connector / loose low-voltage connection	Confirm the outdoor disconnect and indoor breaker are ON; Set the thermostat to Cool with a low setpoint; Try one single power cycle at the breaker
EE / no display (EMG mode) / INTERNAL FAULT	Internal control fault or no power to the indoor blower control board pro repair	No 208/230V or 24V power to the blower/control board; Blown fuse or tripped circuit breaker; Short in 208/230V or 24V circuit	Check the indoor and outdoor breakers are ON; Confirm the furnace/air-handler power switch is ON; Try one single power cycle at the breaker
EF / E_EF AUXILIARY SWITCH OPEN	Auxiliary/safety switch open on the air handler (e.g. condensate float switch tripped) pro repair	High water level in the evaporator drain pan (clogged condensate drain); Connected alarm device activated; Auxiliary alarm terminals open	Check for standing water near the indoor unit and a backed-up condensate drain; Set thermostat to Cool and retry after clearing any obvious drain blockage at the pan if safely accessible
b0 (Eb0) / NO ID AIRFLOW / Blower Motor Not Running	Indoor blower motor not running / estimated indoor airflow near 0 CFM pro repair	Fan/motor obstruction; Power interruption / low voltage; Incorrect or loose wiring	Check and replace a dirty air filter; Make sure supply and return vents are open and unblocked; Try one single power cycle at the breaker
b1 (E_b1) / Blower Communication Error	Communication error between the control board and the blower motor pro repair	Incorrect or loose wiring; Power interruption / low voltage; Faulty control board or motor	Try one single power cycle at the breaker
b9 (Eb9) / LOW ID AIRFLOW	Estimated indoor airflow is lower than the airflow requirement (low indoor airflow, minor code) pro repair	Too much static pressure (restricted ductwork/filter); Failed indoor blower motor; Blower motor not properly connected	Replace a dirty air filter; Open all supply and return vents and clear any blockage; Make sure the return grille is not obstructed
d0 (E_d0) / NO NET DATA / Ed0	Control board does not have the shared data it needs on the network to operate pro repair	No shared data loaded on the network; Communicating system not yet commissioned	No homeowner fix; requires technician data programming
d1 (E_d1) / INVALID DATA / Ed1	Invalid shared data on the network for the control module pro repair	Wrong shared data on the network; Network data invalid for the control module	No homeowner fix; requires technician data programming
E13	High pressure (critical) – equipment experiencing frequent high-pressure faults pro repair	Blocked/restricted condenser coil or lines; Service (stop) valve not fully open; Refrigerant overcharge	Clear leaves, grass and debris from around the outdoor condenser and keep it free of obstructions; Set thermostat to Cool and try one single power cycle at the breaker
E15	Low pressure (critical) – equipment experiencing frequent low-pressure faults pro repair	Service (stop) valve not fully open; Restriction in refrigerant lines; Low refrigerant charge / refrigerant leak	Replace a dirty air filter and make sure indoor airflow is not blocked; Set thermostat to Cool and retry once
E17	Compressor fail – equipment experiencing frequent compressor faults pro repair	Service (stop) valve not fully open; Compressor wire lost phase / wiring issue; Compressor motor failure	Try one single power cycle at the breaker
E19	PCB or fan fail – frequent outdoor control board and/or fan motor faults pro repair	Obstruction in fan rotation; Outdoor fan motor not properly connected; Outdoor fan not running	Check the outdoor fan grille for debris (leaves/branches) and clear obstructions; Try one single power cycle at the breaker
E22	High discharge temperature – frequent high discharge-temperature faults; discharge thermistor may be misplaced pro repair	Discharge thermistor inoperable or improperly connected/positioned; Low refrigerant charge or overcharge; Faulty compressor	Make sure the outdoor condenser is clear of debris; Try one single power cycle at the breaker
E23	Discharge temperature sensor fail – discharge temperature sensor out of range pro repair	Discharge thermistor inoperable or improperly connected	No homeowner fix; requires technician sensor service
E24	HPS open – the high-pressure switch is open pro repair	High-pressure switch inoperable; Condition that caused high pressure (dirty coil, blocked condenser, overcharge)	Clear debris from around the outdoor condenser; Try one single power cycle at the breaker
E25 / AIR SENSOR FLT	Outdoor air temperature sensor is open or shorted pro repair	Faulty outdoor thermistor sensor or disconnected sensor	No homeowner fix; requires technician sensor service
E26 / PRESSURE SENSOR	Pressure sensor not reacting properly pro repair	Low-pressure sensor inoperable or not properly connected	No homeowner fix; requires technician service
E31 / HI LEAK CURRENT	Control detected high leakage current (high-voltage leakage to ground) pro repair	Improper ground; Faulty compressor	Turn the unit off and leave it off; this is an electrical fault – call a licensed technician
E34 / CURRENT SPIKE	High current condition detected, indicating potential for a short circuit pro repair	Current spike in supply; Service (stop) valve not fully open; Compressor wire lost phase	Leave the unit off; this is an electrical fault – call a licensed technician
E35 / HIGH CURRENT	High current condition detected on the outdoor control board pro repair	Short-circuit condition; Service (stop) valve not fully open; Refrigerant overcharge	Leave the unit off; this is an electrical fault – call a licensed technician
E41 / LOW REFRIGERANT	Control detected a low refrigerant condition pro repair	Refrigerant leak; Low refrigerant charge; Thermistors inoperable or not properly connected	No homeowner fix; refrigerant work must be done by a licensed technician
E42 / LOW LINE VOLT	Control detected a low power-supply voltage condition pro repair	Low line voltage supply; Tripped breaker / blown fuse; Utility supply issue	Check the breaker for the AC is fully ON (not tripped); Try one single power cycle at the breaker
E43 / HIGH LINE VOLT	Control detected a high power-supply voltage condition pro repair	High line voltage supply; Utility supply issue	No homeowner fix; line-voltage issue requires a technician/utility
E44 / OP TEMP RANGE	Outdoor temperature is outside the recommended operating range; unit may still operate normally DIY-checkable	Ambient air temperature too high or too low for normal operation	Wait and retry during a more moderate outdoor temperature; Try one single power cycle at the breaker
E50 / LINE VOLT CTRL	Voltage issue on the outdoor control board pro repair	High or low voltage from supply; Faulty control board	Check the breaker is fully ON; Try one single power cycle at the breaker
E51 / OD COMM ERROR	Communication issue detected by the outdoor control board (communicating/ComfortNet system) pro repair	Communication wiring disconnected or loose	Try one single power cycle at the breaker
E11 / RUN SYS TEST	Thermostat message indicating the required start-up System Verification Test must be run (commissioning step, not a failure) pro repair	Initial system test not yet completed after install or board/data change	No action needed by homeowner; the installer runs the System Verification Test from the ComfortNet menu
Ed0 / D1 INVALID DATA / D2 INVALID SYSTEM / D3 INVALID CONFIG / D4 INVALID MC DATA (outdoor)	Outdoor control board shared-data / configuration faults (no data, invalid data, airflow mismatch, hardware mismatch, or rejected data loader data) pro repair	Outdoor unit shared data missing, invalid, or incompatible with the system; Communication wiring loose; Data loader (BTSDL01) data rejected or wrong	No homeowner fix; requires technician data programming

Goodman air conditioner codes we get called for most

E5 (indoor board) / E_E5 BLOWN FUSE — Fuse open on the indoor air-handler control board (24V control fuse blown)

Typical causes include blown control-board fuse (f1u); short in 24v control wiring; open connector / loose low-voltage connection. A few things are safe to check yourself (Confirm the outdoor disconnect and indoor breaker are ON; Set the thermostat to Cool with a low setpoint), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes E5 (indoor board) / E_E5 BLOWN FUSE on Goodman air conditioners throughout Greater Vancouver.

E22 — High discharge temperature – frequent high discharge-temperature faults; discharge thermistor may be misplaced

Typical causes include discharge thermistor inoperable or improperly connected/positioned; low refrigerant charge or overcharge; faulty compressor. A few things are safe to check yourself (Make sure the outdoor condenser is clear of debris; Try one single power cycle at the breaker), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes E22 on Goodman air conditioners throughout Greater Vancouver.

d1 (E_d1) / INVALID DATA / Ed1 — Invalid shared data on the network for the control module

Typical causes include wrong shared data on the network; network data invalid for the control module. A few things are safe to check yourself (No homeowner fix; requires technician data programming), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes d1 (E_d1) / INVALID DATA / Ed1 on Goodman air conditioners throughout Greater Vancouver.

E13 — High pressure (critical) – equipment experiencing frequent high-pressure faults

Typical causes include blocked/restricted condenser coil or lines; service (stop) valve not fully open; refrigerant overcharge. A few things are safe to check yourself (Clear leaves, grass and debris from around the outdoor condenser and keep it free of obstructions; Set thermostat to Cool and try one single power cycle at the breaker), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes E13 on Goodman air conditioners throughout Greater Vancouver.

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

Most Goodman 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.

Goodman air conditioner repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Goodman 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.

Goodman air conditioner service areas

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

Goodman air conditioner error code FAQs

Can I reset my Goodman 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 Goodman b1 (E_b1) / Blower Communication Error code mean?

On Goodman air conditioners, b1 (E_b1) / Blower Communication Error commonly indicates communication error between the control board and the blower motor. 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 Goodman air conditioners you didn’t install?

Yes. HeatLand is brand-agnostic and services Goodman 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 Goodman 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 Goodman air conditioner repair cost in Vancouver?

It depends on the fault. Many Goodman 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

HeatLand repairs every major air conditioner brand across Greater Vancouver. More brand guides: