ICP Error Code 6: Open start circuit (Heat Pump)
ICP error code 6 on a heat pump means: Open start circuit. It is also called ICP diagnostic code 6.
Homeowner? What ICP code 6 means for you
Call a technician Your heat pump is reporting: Open start circuit. 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 6 mean?
Current only in the run circuit - start circuit is open.
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 6
- Failed run capacitor
- Open start wiring or connection
- Damaged start winding
ICP models that use code 6
Other ICP Heat Pump codes
All ICP Heat Pump error codes →
ICP code 6: homeowner questions
What does ICP code 6 mean?
Open start circuit. Current only in the run circuit - start circuit is open.
Is it safe to keep using my heat pump with code 6?
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 6 myself?
You can try one reset (power off for 30 seconds, then on). If ICP code 6 comes back, the cause is still there and a licensed technician should check it.
Who can fix ICP code 6 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.