KeepRite · Heat pump

25 Model plug missing or invalid

High severity KeepRite *CA/*CH Two-Stage Communicating

What the control is telling you

The two-stage board cannot find a valid model plug and will not run.

Applies to: KeepRite *CA7/*CA9 AC and *CH6/*CH9 HP two-stage communicating

Likely causes

Model plug missing, loose or wrong

Test and repair steps

Check the model plug is fitted and seated.
Compare its part number and resistances with the model plug table for the unit size.
On a replacement board, move the original plug over.

Models that show this code

8 models in KeepRite *CA/*CH Two-Stage Communicating

*CH624*CH636*CH648*CH660*CH924*CH936*CH948*CH960

Other codes on the same units

16 Lost communication with wall control
31 High pressure switch open
32 Low pressure switch open
45 Outdoor control board failure
46 Brown-out (low voltage)
47 No 230 V at the unit
53 Outdoor air temperature sensor fault
55 Outdoor coil sensor fault

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Source: 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). Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.