Fujitsu Error Code OPERATION + TIMER lamps flash together: Test run / forced cooling running (Heat Pump)
Fujitsu error code OPERATION + TIMER lamps flash together on a heat pump means: Test run / forced cooling running. It is also called Fujitsu diagnostic code OPERATION + TIMER lamps flash together.
Homeowner? What Fujitsu code OPERATION + TIMER lamps flash together means for you
Usually minor Your heat pump is reporting: Test run / forced cooling running. 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) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Fujitsu error code OPERATION + TIMER lamps flash together mean?
The green OPERATION lamp and the orange TIMER lamp flash at the same time while the unit is in test run or forced cooling. It is normal and means the test run was started from the remote TEST RUN key or by holding MANUAL AUTO. It is not an error code. The wall-unit manual also mentions a slow simultaneous flash while a test run started with the remote's test run key is running.
Applies to: Fujitsu ductless heat pumps: Fujitsu wall-mounted 7-15 (NA ASU/AOU type); Fujitsu ductless heat pumps: Fujitsu multi-zone outdoor 18/24 type (18 type 2-zone, 24 type 3-zone)
Other Fujitsu Heat Pump codes
All Fujitsu Heat Pump error codes →
Fujitsu code OPERATION + TIMER lamps flash together: homeowner questions
What does Fujitsu code OPERATION + TIMER lamps flash together mean?
Test run / forced cooling running. The green OPERATION lamp and the orange TIMER lamp flash at the same time while the unit is in test run or forced cooling. It is normal and means the test run was started from the remote TEST RUN key or by holding MANUAL AUTO. It is not…
Is it safe to keep using my heat pump with code OPERATION + TIMER lamps flash together?
Usually yes. Code OPERATION + TIMER lamps flash together is normally minor, but if it keeps coming back have it checked.
Can I reset Fujitsu code OPERATION + TIMER lamps flash together myself?
You can try one reset (power off for 30 seconds, then on). If Fujitsu code OPERATION + TIMER lamps flash together comes back, the cause is still there and a licensed technician should check it.
Who can fix Fujitsu code OPERATION + TIMER lamps flash together 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
Troubleshooting guides
- 2 flashes: HPS open ≥6 s; 3: discharge >263°F; 4: discharge <90°F after 1 h; 5: defrost failure; 6: discharge sensor short; 7: outdoor sensor open/short; 9: bonnet sensor fail All brands · Heat Pump
- Excess ice on outdoor coil All brands · Heat Pump
- Extremely high head pressure in heating (dual fuel) All brands · Heat Pump
- Insufficient heat in cold weather All brands · Heat Pump
- Liquid slugging / compressor damage in heating All brands · Heat Pump
- No mode change / wrong mode All brands · Heat Pump
- Odour at registers (dirty sock) All brands · Heat Pump
- Poor heating but OK cooling (or vice-versa) All brands · Heat Pump
- Service problem analysis (Amana chart excerpt) All brands · Heat Pump
- Subcooling too high All brands · Heat Pump
- Subcooling too low vs mfr target All brands · Heat Pump
- TXV bulb/diaphragm failure All brands · Heat Pump
- Water-source: coil freezing All brands · Heat Pump
- Won't change mode / both coils same temperature All brands · Heat Pump
- Wrong superheat after line-set change; poor capacity All brands · Heat Pump
- Change the wireless remote custom code (A/B/C/D) Fujitsu · Heat Pump
- Enter the indoor function setting mode (wireless remote) Fujitsu · Heat Pump
- Recall the stored error on the indoor lamps Fujitsu · Heat Pump
- Start a forced cooling test run from the indoor unit Fujitsu · Heat Pump
- Start a test run from the wired remote Fujitsu · Heat Pump
Source: Fujitsu Wall-mounted 7-9-12-15 (North American trilingual, UTY-RNNUM remotes; e.g. ASU9-12-15 RLF1-RLS familie.pdf - section 12 Test run; Fujitsu Outdoor unit 18-24 type (North American trilingual) installation P-N 9374747160.pdf - section 9 Pump down operation. 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.