Fujitsu Error Code 44: Human (occupancy) sensor error (Heat Pump)

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

Fujitsu error code 44 on a heat pump means: Human (occupancy) sensor error. It is also called Fujitsu diagnostic code 44.

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

Homeowner? What Fujitsu code 44 means for you

Usually minor Your heat pump is reporting: Human (occupancy) sensor error. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

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 44 mean?

The occupancy sensor has failed or is disconnected. Indoor lamps: OPERATION (green) flashes 4x, TIMER (orange) flashes 4x, ECONOMY (green) flashes fast nonstop; wired remote shows 44.

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

Common causes of Fujitsu code 44

Sensor plug
Sensor fault

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
32	Indoor main PCB error (EEPROM / model info)
33	Indoor fan motor power consumption error
35	MANUAL AUTO button error
39	Indoor fan motor power supply error
41	Room (intake air) temperature sensor error
42	Indoor coil (heat exchanger middle) sensor error
51	Indoor fan motor error
52	Indoor electronic expansion valve error
53	Drain pump error
57	Damper error
58	Intake grille error
61	Outdoor reverse / missing phase or wiring error

All Fujitsu Heat Pump error codes →

Fujitsu code 44: homeowner questions

What does Fujitsu code 44 mean?

Human (occupancy) sensor error. The occupancy sensor has failed or is disconnected. Indoor lamps: OPERATION (green) flashes 4x, TIMER (orange) flashes 4x, ECONOMY (green) flashes fast nonstop; wired remote shows 44.

Is it safe to keep using my heat pump with code 44?

Usually yes. Code 44 is normally minor, but if it keeps coming back have it checked.

Can I reset Fujitsu code 44 myself?

You can try one reset (power off for 30 seconds, then on). If Fujitsu code 44 comes back, the cause is still there and a licensed technician should check it.

Who can fix Fujitsu code 44 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.