KeepRite Error Code 53: Outdoor air temperature sensor fault (Heat Pump)
KeepRite error code 53 on a heat pump means: Outdoor air temperature sensor fault. It is also called KeepRite diagnostic code 53.
Homeowner? What KeepRite code 53 means for you
Check, then call Your heat pump is reporting: Outdoor air temperature sensor fault. 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 KeepRite error code 53 mean?
The outdoor air thermistor reads open, shorted or out of range.
Applies to: KeepRite *SA5/*SA6 AC and *SH4/*SH5/*SH6 HP single-stage communicating; *CA7/*CA9 AC and *CH6/*CH9 HP two-stage communicating
Common causes of KeepRite code 53
- Failed OAT thermistor
- Wiring or connector fault
KeepRite models that use code 53
*CH624*CH636*CH648*CH660*CH924*CH936*CH948*CH960*SH4*SH5*SH6
Other KeepRite Heat Pump codes
All KeepRite Heat Pump error codes →
KeepRite code 53: homeowner questions
What does KeepRite code 53 mean?
Outdoor air temperature sensor fault. The outdoor air thermistor reads open, shorted or out of range.
Is it safe to keep using my heat pump with code 53?
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 KeepRite code 53 myself?
You can try one reset (power off for 30 seconds, then on). If KeepRite code 53 comes back, the cause is still there and a licensed technician should check it.
Who can fix KeepRite code 53 near me?
Aurora Star Tech Inc. repairs KeepRite 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
- Forcing a defrost to test the board - KeepRite N4H4/R4H4/WCH4/NXH5 KeepRite · Heat Pump
- Outdoor unit will not run or will not defrost - KeepRite heat pump defrost board (FAST 1173636/1177927/1190281) KeepRite · Heat Pump
Source: KeepRite/ICP C4A3/H4A3/T4A3/CXA6 Installation Instructions 421 01 5103 05, Table 1 Status Codes, p.17; KeepRite_ICP_KeepRite_Tempstar_Heil_split_A_C_HP_R_410A_R_22_service_421_08_5400_04.txt - section Table 13 Status Codes (single-stage); KeepRite_ICP_KeepRite_Tempstar_Heil_split_A_C_HP_R_410A_R_22_service_421_08_5400_04.txt - section Table 17 Troubleshooting (two-stage). 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.