ICP Error Code Red TRIP LED: Comfort Alert TRIP – Y1 call but compressor not running (Heat Pump)
ICP error code Red TRIP LED on a heat pump means: Comfort Alert TRIP - Y1 call but compressor not running. It is also called ICP diagnostic code Red TRIP LED.
Homeowner? What ICP code Red TRIP LED means for you
Call a technician Your heat pump is reporting: Comfort Alert TRIP - Y1 call but compressor not running. 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 ICP error code Red TRIP LED mean?
Thermostat Y1 demand is present at the module but the compressor is not running.
Applies to: ICP N4H3 R-410A split heat pump (manual 428 01 5103 02); Comfort Alert codes apply only to units factory-fitted with the Comfort Alert module
Common causes of ICP code Red TRIP LED
- Compressor internal protector open
- Outdoor disconnect open
- Compressor breaker or fuses open
A technician checks these and 3 other possible causes on site before replacing any part.
ICP models that use code Red TRIP LED
Other ICP Heat Pump codes
| Code | Meaning |
|---|---|
| 4 | Locked rotor |
| 5 | Open circuit |
| 6 | Open start circuit |
| 7 | Open run circuit |
| 8 | Welded contactor |
| 9 | Low voltage |
| TRIP + ALERT flashing together | Control voltage too low |
All ICP Heat Pump error codes →
ICP code Red TRIP LED: homeowner questions
What does ICP code Red TRIP LED mean?
Comfort Alert TRIP - Y1 call but compressor not running. Thermostat Y1 demand is present at the module but the compressor is not running.
Is it safe to keep using my heat pump with code Red TRIP LED?
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 ICP code Red TRIP LED myself?
You can try one reset (power off for 30 seconds, then on). If ICP code Red TRIP LED comes back, the cause is still there and a licensed technician should check it.
Who can fix ICP code Red TRIP LED near me?
Aurora Star Tech Inc. repairs ICP 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
- Comfort Alert module basics ICP · Heat Pump
- Defrost not working - test the defrost board ICP · Heat Pump
Source: ICP N4H3 Installation Instructions 428 01 5103 02, Comfort Alert Diagnostics Codes (Figure 18), p.20. 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.