Fujitsu Error Code 27: Primary / secondary unit setup error (Heat Pump)
Fujitsu error code 27 on a heat pump means: Primary / secondary unit setup error. It is also called Fujitsu diagnostic code 27.
Homeowner? What Fujitsu code 27 means for you
Check, then call Your heat pump is reporting: Primary / secondary unit setup error. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
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 27 mean?
Master (primary) and slave (secondary) unit roles are set wrong in a simultaneous multi system. Indoor lamps: OPERATION (green) flashes 2x, TIMER (orange) flashes 7x, ECONOMY (green) flashes fast nonstop; wired remote shows 27.
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 27
- Primary/secondary DIP or function setting wrong
Other Fujitsu Heat Pump codes
All Fujitsu Heat Pump error codes →
Fujitsu code 27: homeowner questions
What does Fujitsu code 27 mean?
Primary / secondary unit setup error. Master (primary) and slave (secondary) unit roles are set wrong in a simultaneous multi system. Indoor lamps: OPERATION (green) flashes 2x, TIMER (orange) flashes 7x, ECONOMY (green) flashes fast nonstop; wired remote shows 27.
Is it safe to keep using my heat pump with code 27?
It depends on the cause. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Can I reset Fujitsu code 27 myself?
You can try one reset (power off for 30 seconds, then on). If Fujitsu code 27 comes back, the cause is still there and a licensed technician should check it.
Who can fix Fujitsu code 27 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.