Fujitsu Heat Pump Error Codes — Meanings, Causes & Repair in Greater Vancouver

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

The codes below apply across common Fujitsu models (Halcyon, AIRSTAGE). Meanings follow Fujitsu’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 Fujitsu heat pump error codes

Fujitsu (Fujitsu General) ductless systems show a two-character error code (e.g. 11, 42, 97, A1) on the wired remote controller. On systems without a wired controller, the same code is read from the indoor display LEDs: the OPERATION lamp blinks N times and the TIMER lamp blinks M times to spell the two digits, with the ECONOMY/feed lamp on continuously. Outdoor PCB fault detail is also indicated by a count of LED flashes on the outdoor control board. Codes here are the documented two-character values from the Fujitsu General America 410A mini-split troubleshooting guide. Many older units enter self-diagnosis to recall the stored code via the remote; the latest code can also be confirmed with the ENTER button and prior codes scrolled with the SELECT button on the wired remote.

Fujitsu heat pump error codes & what they mean

These are the Fujitsu heat pump 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
11	Serial communication error – at start-up the indoor (evaporator) and outdoor (condenser) units are not communicating pro repair	Loose, damaged, or miswired interconnecting communication wiring between indoor and outdoor units; Incorrect or low supply voltage at panel, condenser, or evaporator; Failed indoor or outdoor control PCB	Confirm the breaker is on and reset it once; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
12	Wired remote controller communication error – the indoor unit cannot receive the signal from the wired remote control for more than 1 minute during normal operation pro repair	Loose or damaged wired remote controller cable; Failed wired remote controller; Failed indoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
13	Compressor control / rotor position error – the compressor rotor location cannot be detected (can result in a permanent stop) pro repair	Open or damaged compressor wiring; Failed compressor; Failed inverter / outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
14	IPM (intelligent power module) error / outdoor unit fan motor error – abnormal condition detected at the inverter power module or outdoor fan circuit pro repair	Blocked heat radiation at the outdoor unit (air inlet/outlet obstructed); Failed outdoor fan motor; Failed inverter/IPM or outdoor control PCB	Clear leaves, snow, and debris away from the outdoor unit so air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
15	Outdoor unit fan motor (lock / abnormal) error – the fan motor is locked, caught, or dropped off, or an abnormal fan condition is detected pro repair	Outdoor fan blade jammed by ice, debris, or damage; Failed or locked outdoor fan motor; Loose connector on the outdoor control PCB	Clear ice, leaves, and debris away from the outdoor fan and unit; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
16	Heat exchanger (mid) thermistor error / pressure switch error – sensor or pressure-switch fault detected at the outdoor unit (meaning varies by model) pro repair	Open or shorted outdoor thermistor; Pressure switch fault or low refrigerant condition; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
17	Outdoor unit PCB microcomputer communication error / IPM error (varies by model) pro repair	Internal communication fault on the outdoor control PCB; Power supply noise or voltage abnormality; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
18	External communication error – after receiving a signal from the external I/O PCB, the same signal has not been received again, or a loose/open connection exists pro repair	Loose or removed connection between the controller PCB and the external I/O PCB; Open or miswired external accessory cable; Failed external I/O or controller PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
21	Outdoor unit PCB model information error (power supply / circuit abnormal) pro repair	Incorrect PCB model data after a board replacement; Power supply circuit fault; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
22	Active filter error / indoor unit capacity error – the connected indoor capacity is out of range, or an active filter abnormality is detected (varies by model) pro repair	Total connected indoor capacity exceeds or is below the allowed range; Active filter module fault; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
23	Combination error – the outdoor unit received a signal that the applied indoor unit is the wrong type (e.g. a multi-type indoor on a single system) or the wiring is incorrect pro repair	Mismatched / incompatible indoor unit connected; Incorrect interconnecting wiring; Wrong model pairing	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
24	Address setting error / number-of-units error – the number or addressing of connected indoor units is out of the specified rule, or an invalid command was input to the outdoor unit pro repair	Incorrect indoor unit addressing; Wrong number of indoor units connected; Installation/setup error	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
26	Address setting error in wired remote controller system – the auto/manual address number is set incorrectly pro repair	Duplicate or incorrect remote controller address; Wiring error in the remote controller group; Failed controller PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
29	Connection unit number error – the number of connecting indoor units is out of the specified rule pro repair	Too many or too few indoor units connected; Wiring/installation error	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
32	Indoor unit EEPROM error – access to the indoor unit's non-volatile EEPROM memory failed pro repair	Corrupted EEPROM data; Power supply noise/surge; Failed indoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
33	Indoor unit motor electricity consumption detection error – the motor voltage or current value is abnormal pro repair	Indoor fan caught, dropped off, or locked; Excessive ambient temperature around the motor; Failed indoor fan motor or control PCB	Confirm the indoor air filters are clean and air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
35	Manual auto (forced) switch error – the manual/auto switch has been on for 60 or more consecutive seconds pro repair	Manual/auto button stuck in the pressed-in position; Failed switch; Failed indoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
3A	Indoor unit communication circuit (wired remote controller) error – the indoor unit detects an abnormal remote controller circuit configuration pro repair	Loose terminal connection at the indoor unit; Wired remote controller wiring fault; Failed controller PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
41	Indoor room thermistor error – the room temperature thermistor detected an abnormal temperature (open or short) pro repair	Open or shorted room temperature thermistor; Loose thermistor connector; Failed indoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
42	Indoor heat exchanger (pipe) thermistor error – the evaporator pipe thermistor detected an abnormal temperature (open or short) pro repair	Open or shorted indoor pipe (heat exchanger) thermistor; Loose thermistor connector; Failed indoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
44	Human sensor error – the human-detection sensor connector is loose/removed or the sensor cable is open (on models equipped with a human sensor) pro repair	Loose or removed human sensor connector; Open sensor cable; Failed human sensor	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
51	Indoor unit fan motor error – the actual indoor fan frequency stays below 1/3 of the target for more than 56 seconds (fan not reaching speed / locked) pro repair	Indoor fan blade jammed or obstructed; Failed or locked indoor fan motor; Loose fan motor connector	Confirm the indoor air filters are clean and nothing is blocking the air outlet; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
53	Drain pump error – the float switch has been on for more than 3 minutes (condensate not draining) pro repair	Blocked or dirty condensate drain; Failed drain pump; Stuck or failed float switch	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
58	Intake grille error – the intake grille micro switch is detected open while the compressor is running (on models with a powered intake grille) pro repair	Intake grille not fully closed/seated; Failed micro switch; Wiring fault	Confirm the intake grille/panel is closed properly; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
62	Outdoor unit main PCB error – access to the EEPROM failed after the outdoor unit started pro repair	Corrupted EEPROM / PCB data; Power supply noise or surge; Failed outdoor main control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
63	Inverter error – error information was received from the inverter/transistor PCB pro repair	Inverter/transistor PCB fault; Compressor electrical fault; Power supply abnormality	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
64	Active filter / PFC circuit error – the inverter input DC voltage went too high (above ~425 V) or too low (below ~80 V), or a momentary power interruption occurred (model dependent) pro repair	Supply voltage too high or too low / momentary power cut; Active filter module or PFC circuit fault; Failed outdoor control PCB	Check that household power is stable (no flickering / brownouts); Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
65	IPM error / trip terminal error – an abnormal current value is detected at the IPM, often because heat radiation (air inlet/outlet) is blocked pro repair	Blocked outdoor airflow (inlet/outlet obstructed); Failed IPM/inverter PCB; Compressor electrical fault	Clear debris, leaves, and snow away from the outdoor unit so air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
71	Discharge thermistor error – the discharge pipe temperature thermistor is open or short-circuited at power-up or while the compressor runs pro repair	Open or shorted discharge thermistor; Loose thermistor connector; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
72	Compressor thermistor error – the compressor temperature thermistor is open or short-circuited at power-up or while the compressor runs pro repair	Open or shorted compressor thermistor; Loose thermistor connector; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
73	Heat exchanger (pipe) thermistor error – the outdoor heat exchanger temperature thermistor is open or short-circuited at power-on or while the compressor runs pro repair	Open or shorted outdoor heat exchanger thermistor; Loose thermistor connector; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
74	Outdoor thermistor error – the outdoor air temperature thermistor is open or short-circuited at power-on or while the compressor runs pro repair	Open or shorted outdoor air thermistor; Loose thermistor connector; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
75	Suction gas / suction pipe thermistor error – the suction temperature thermistor is open or short-circuited pro repair	Open or shorted suction thermistor; Loose thermistor connector; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
77	Heat sink thermistor error – the heat-sink (IPM) temperature thermistor is open or short-circuited at power-up or while the compressor runs pro repair	Open or shorted heat-sink thermistor; Failed IPM / outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
84	Current sensor error – the input current sensor read 0 A while the inverter compressor was operating above ~56 rps, one minute after compressor start (excluding defrost) pro repair	Failed current sensor; Compressor or inverter wiring fault; Failed outdoor control PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
86	High pressure switch / pressure sensor error – the pressure switch was detected open for longer than 10 seconds after power-on pro repair	Refrigerant / pressure abnormality; Closed service valve; Failed pressure switch or sensor	Clear debris away from the outdoor unit so air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
94	Trip detection / over-current error – the inverter compressor protection-stopped on over-current after start-up, generated consecutively (e.g. 10 times in a row) pro repair	Compressor overload or electrical fault; Blocked outdoor airflow / overcharge / refrigerant issue; Failed inverter PCB	Clear debris away from the outdoor unit so air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
95	Compressor motor control error – the detected rotor location is more than ~90 degrees out of phase with the actual rotor location, stopping the compressor; repeats stop the compressor again pro repair	Open or faulty compressor wiring; Failed compressor; Failed inverter PCB	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
97	Outdoor unit fan motor (1) error – the outdoor fan rotation speed is below ~100 RPM within 20 seconds of start; after restart, three repeats within 60 seconds stop the compressor and fan pro repair	Outdoor fan jammed by ice/debris or damaged; Failed outdoor fan motor; Loose fan motor connector / failed PCB	Clear ice, leaves, and debris away from the outdoor fan and unit; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
98	Outdoor unit fan motor 2 error – the second outdoor fan rotation speed is below ~100 RPM within 20 seconds of start; repeats stop the compressor and fan (twin-fan models) pro repair	Second outdoor fan jammed by ice/debris or damaged; Failed outdoor fan motor 2; Loose fan motor connector / failed PCB	Clear ice, leaves, and debris away from the outdoor fans and unit; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
99	4-way valve error – when the indoor heat exchanger temperature is compared with the room temperature, an out-of-range condition (reversing valve not switching correctly) is detected twice in a row and the compressor stops pro repair	Stuck or failed 4-way (reversing) valve; Failed reversing valve coil; Thermistor reading error	Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
A1	Discharge temperature error – protection stop because discharge temperature reached approximately 230 degrees F (110 degrees C) during compressor operation, occurring twice within 24 hours pro repair	Closed service (3-way) valve; Low refrigerant charge / restriction (EEV or strainer); Failed discharge thermistor	Clear debris away from the outdoor unit so air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
A3	Compressor temperature error – protection stop because compressor temperature reached approximately 226 degrees F (107.8 degrees C) during operation, occurring twice within 24 hours pro repair	Closed service (3-way) valve; Low refrigerant / restriction (EEV or strainer); Failed compressor thermistor or loose connection	Clear debris away from the outdoor unit so air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset
A5	Low pressure error – protection stop because suction pressure stayed at or below approximately 7.35 PSI (about 0.02 MPaG) for 5 minutes, repeating 5 times within 2 hours pro repair	Low refrigerant charge or leak; Restricted refrigerant flow (EEV coil / strainer); Failed suction pressure sensor	Confirm the indoor air filters are clean and outdoor airflow is unobstructed; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset

Fujitsu heat pump codes we get called for most

11 — Serial communication error – at start-up the indoor (evaporator) and outdoor (condenser) units are not communicating

Typical causes include loose, damaged, or miswired interconnecting communication wiring between indoor and outdoor units; incorrect or low supply voltage at panel, condenser, or evaporator; failed indoor or outdoor control pcb. A few things are safe to check yourself (Confirm the breaker is on and reset it once; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes 11 on Fujitsu heat pumps throughout Greater Vancouver.

16 — Heat exchanger (mid) thermistor error / pressure switch error – sensor or pressure-switch fault detected at the outdoor unit (meaning varies by model)

Typical causes include open or shorted outdoor thermistor; pressure switch fault or low refrigerant condition; failed outdoor control pcb. A few things are safe to check yourself (Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes 16 on Fujitsu heat pumps throughout Greater Vancouver.

13 — Compressor control / rotor position error – the compressor rotor location cannot be detected (can result in a permanent stop)

Typical causes include open or damaged compressor wiring; failed compressor; failed inverter / outdoor control pcb. A few things are safe to check yourself (Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes 13 on Fujitsu heat pumps throughout Greater Vancouver.

14 — IPM (intelligent power module) error / outdoor unit fan motor error – abnormal condition detected at the inverter power module or outdoor fan circuit

Typical causes include blocked heat radiation at the outdoor unit (air inlet/outlet obstructed); failed outdoor fan motor; failed inverter/ipm or outdoor control pcb. A few things are safe to check yourself (Clear leaves, snow, and debris away from the outdoor unit so air flows freely; Turn the system off at the breaker for 5 minutes, then restore power to attempt a single reset), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes 14 on Fujitsu heat pumps throughout Greater Vancouver.

Is it safe to keep running a Fujitsu heat pump with a fault code?

Most Fujitsu fault codes put the heat pump into a safe lockout for a reason. You can safely check the basics — the power and breaker on, the indoor filter clean, the outdoor unit clear of snow, ice and debris, and the remote set to the correct mode and temperature — and restart it once. If the code returns, stop and book a technician. Mini-split and heat-pump faults are electrical and refrigerant issues — never open the indoor or outdoor unit, and never touch the wiring or refrigerant lines yourself.

Fujitsu heat pump repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Fujitsu heat pumps — sensor and thermistor errors, indoor-to-outdoor 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 heat pump 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 heat pump repair. Explore Heat Pump services, browse all heat pump error codes by brand, or request a free estimate.

Fujitsu heat pump service areas

We repair Fujitsu heat pumps across Greater Vancouver and the Fraser Valley, including:

Fujitsu heat pump error code FAQs

Can I reset my Fujitsu heat pump 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 indoor filter clean, the outdoor unit clear of snow, ice and debris, and the remote set to the correct mode and temperature). If the heat pump faults again right away, stop and note the code — repeatedly resetting a heat pump that keeps locking out can mask a real problem. Call a licensed HVAC technician to diagnose it.

What does the Fujitsu 11 code mean?

On Fujitsu heat pumps, 11 commonly indicates serial communication error – at start-up the indoor (evaporator) and outdoor (condenser) units are not communicating. 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 Fujitsu heat pumps you didn’t install?

Yes. HeatLand is brand-agnostic and services Fujitsu heat pumps 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 Fujitsu heat pump fault code an emergency?

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

How much does Fujitsu heat pump repair cost in Vancouver?

It depends on the fault. Many Fujitsu 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 Heat Pump error-code guides

HeatLand repairs every major heat pump brand across Greater Vancouver. More brand guides: