Fujitsu Error Code 61: Outdoor reverse / missing phase or wiring error (Heat Pump)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Fujitsu error code 61 on a heat pump means: Outdoor reverse / missing phase or wiring error. It is also called Fujitsu diagnostic code 61.

High severityHeat PumpFujitsu slim duct ARU 7-18 (LL type)

Homeowner? What Fujitsu code 61 means for you

Call a technician Your heat pump is reporting: Outdoor reverse / missing phase or wiring error. The heat pump has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
In winter, keep snow and ice off and away from the outdoor unit. A short defrost cycle with steam is normal.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Fujitsu error code 61 mean?

Outdoor unit power phase or wiring fault. Indoor lamps: OPERATION (green) flashes 6x, TIMER (orange) flashes 1x, ECONOMY (green) flashes fast nonstop; wired remote shows 61.

Applies to: Fujitsu ductless heat pumps: Fujitsu slim duct ARU 7-18 (LL type)

Common causes of Fujitsu code 61

Phase reversed or missing (3-phase)
Wiring error

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Other Fujitsu Heat Pump codes

Code	Meaning
44	Human (occupancy) sensor error
51	Indoor fan motor error
52	Indoor electronic expansion valve error
53	Drain pump error
57	Damper error
58	Intake grille error
62	Outdoor main PCB error (EEPROM / model / micro comms)
63	Inverter error
64	PFC / active filter circuit error
65	IPM / trip terminal L error
68	Rush current limiting resistor temp rise error
71	Discharge temperature sensor error

All Fujitsu Heat Pump error codes →

Fujitsu code 61: homeowner questions

What does Fujitsu code 61 mean?

Outdoor reverse / missing phase or wiring error. Outdoor unit power phase or wiring fault. Indoor lamps: OPERATION (green) flashes 6x, TIMER (orange) flashes 1x, ECONOMY (green) flashes fast nonstop; wired remote shows 61.

Is it safe to keep using my heat pump with code 61?

It depends on the cause. The heat pump has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Can I reset Fujitsu code 61 myself?

You can try one reset (power off for 30 seconds, then on). If Fujitsu code 61 comes back, the cause is still there and a licensed technician should check it.

Who can fix Fujitsu code 61 near me?

Aurora Star Tech Inc. repairs Fujitsu heat pumps in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: AC Running But Not Cooling: What to Check · Heat Pump Not Heating or Blowing Cold Air

Source: Fujitsu Slim duct AR07-09-12-14-18 (ARU-ARYG LL-type equivalent) installation P-N 9381858064.pdf - section 14 Error codes. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.