Fujitsu Error Code 84: Current sensor error (Heat Pump)
Fujitsu error code 84 on a heat pump means: Current sensor error. It is also called Fujitsu diagnostic code 84.
Homeowner? What Fujitsu code 84 means for you
Call a technician Your heat pump is reporting: Current sensor 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) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Fujitsu error code 84 mean?
Outdoor current sensor fault (permanent stop). Indoor lamps: OPERATION (green) flashes 8x, TIMER (orange) flashes 4x, ECONOMY (green) flashes fast nonstop; wired remote shows 84.
Applies to: Fujitsu ductless heat pumps: Fujitsu ductless split/multi/VRF (general code list), Fujitsu wall-mounted 7-15 (NA ASU/AOU type), Fujitsu slim duct ARU 7-18 (LL type)
Common causes of Fujitsu code 84
- Current sensor / outdoor PCB fault
Other Fujitsu Heat Pump codes
All Fujitsu Heat Pump error codes →
Fujitsu code 84: homeowner questions
What does Fujitsu code 84 mean?
Current sensor error. Outdoor current sensor fault (permanent stop). Indoor lamps: OPERATION (green) flashes 8x, TIMER (orange) flashes 4x, ECONOMY (green) flashes fast nonstop; wired remote shows 84.
Is it safe to keep using my heat pump with code 84?
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 84 myself?
You can try one reset (power off for 30 seconds, then on). If Fujitsu code 84 comes back, the cause is still there and a licensed technician should check it.
Who can fix Fujitsu code 84 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 All Fujitsu split - multi - VRF (generic code list) codes.pdf - section error code table (indoor LED flashes); Fujitsu Wall-mounted 7-9-12-15 (North American trilingual, UTY-RNNUM remotes; e.g. ASU9-12-15 RLF1-RLS familie.pdf - section 14 Error codes; 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.