KeepRite Heat Pump: Switch the post-defrost outdoor fan delay off or on
Switch the post-defrost outdoor fan delay off or on on a KeepRite heat pump: Normally the outdoor fan stays off 20 seconds after defrost ends. Shorting the forced-defrost pins for more than 15 seconds while idle toggles this delay; it is kept through power loss.
Applies to: *CA/*CH two-stage communicating heat pump boards
How to fix switch the post-defrost outdoor fan delay off or on: step by step
- With the unit in standby (amber LED on solid), short the FORCED DEFROST pins for more than 15 seconds
- The LED starts flashing when toggled: 4 flashes = delay defeated, 3 flashes = 20 s delay active
- Remove the short; the code stays up until the short is removed and about 5 seconds after
- If you got the wrong state, repeat the toggle
If the unit shows an error code, look it up: KeepRite Heat Pump codes
Models
*CH624*CH636*CH648*CH660*CH924*CH936*CH948*CH960
Source: KeepRite ICP split A-C + HP (R-410A & R-22) Application Guideline and Service Manual 421 08 5400 04, Defrost / fan delay defeat, p.56-57. 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.