Goodman Heat Pump: Reversing valve not shifting – ComfortNet heat pumps
Reversing valve not shifting - ComfortNet heat pumps on a Goodman heat pump: Heat pump stays in one mode, or suction pressure/temperature is abnormally high because the valve is stuck between positions or leaking.
Applies to: ComfortNet ASZC/GSZC/DSZC heat pumps
Common causes of reversing valve not shifting - comfortnet heat pumps
- No 24 V to the solenoid
- Open solenoid coil
- Pilot plunger stuck
- Main slide stuck mid-position or leaking
How to fix reversing valve not shifting - comfortnet heat pumps: step by step
- In cooling mode check for 24 V at the reversing valve solenoid; if none, trace the control voltage (legacy wiring: thermostat O terminal and wire).
- With voltage present, loosen the coil nut and slide the coil off - you should feel slight magnetic pull and hear the pilot plunger click. No click = stuck pilot.
- Check coil continuity; replace an open coil. Coil OK with 24 V present but valve will not move = replace the valve.
- To try freeing a stuck slide: raise head pressure in cooling (block the outdoor fan discharge), then switch between cooling and heating.
- Leak test by temperature: the suction line after the valve should match true suction; a difference of about 4 F or more means the valve is leaking internally.
If the unit shows an error code, look it up: Goodman Heat Pump codes
Models
Goodman/Amana R-32 GLZS/ALZS
ALZS4BA**10AAALZS4NA**10AAALZS5BA**10AAGLZS4BA**10AAGLZS4MA**10AAGLZS5BA**10AA
Goodman/Amana R-410A GSZ/ASZ/DSZ (ANZ/SSZ/VSZ)
ANZ130181ANZ130241ANZ130301ANZ130361ANZ130421ANZ130481ANZ130601ANZ140181ANZ140241ANZ140301ANZ140361ANZ140421ANZ140481ANZ140491ANZ140601ASZ130181ASZ130241ASZ130301ASZ130361ASZ130421ASZ130481ASZ130601ASZ140181ASZ140241ASZ140301ASZ140361ASZ140381ASZ140421ASZ140481ASZ140491ASZ140601ASZ160181ASZ160241ASZ160301ASZ160361ASZ160421ASZ160481ASZ160601ASZ180361ASZ180481ASZ180601ASZH5***10DSZ160241DSZ160361DSZ160481DSZ160601DSZ180361DSZ180481DSZ180601GSZ110903GSZ110904GSZ111203GSZ111204GSZ130181GSZ130191GSZ130241GSZ130251GSZ130301GSZ130311GSZ130361GSZ130363GSZ130371GSZ130421GSZ130481GSZ130483GSZ130484GSZ130601GSZ140181GSZ140241GSZ140301GSZ140361GSZ140371GSZ140421GSZ140481GSZ140491GSZ140601GSZ160181GSZ160241GSZ160301GSZ160361GSZ160421GSZ160481GSZ160601GSZH5***10SSZ140181SSZ140191SSZ140241SSZ140251SSZ140301SSZ140311SSZ140361SSZ140371SSZ140381SSZ140421SSZ140481SSZ140601SSZ160241SSZ160361SSZ160421SSZ160481SSZ160601VSZ130181VSZ130241VSZ130301VSZ130361VSZ130421VSZ130481VSZ130601VSZ140181VSZ140241VSZ140301VSZ140361VSZ140421VSZ140481VSZ140491VSZ140601
Goodman/Amana ComfortNet ASZC/GSZC/DSZC
ASZC160241ASZC160361ASZC160421ASZC160481ASZC160601ASZC180241ASZC180361ASZC180481ASZC180601DSZC160241DSZC160361DSZC160481DSZC160601DSZC180361DSZC180481DSZC180601GSZC160241GSZC160361GSZC160481GSZC160601GSZC180241GSZC180361GSZC180481GSZC180601
Source: Goodman ComfortNet ASXC/GSXC/DSXC, ASZC/GSZC/DSZC, AVPTC/MBVC service manual, Reversing Valve Troubleshooting p.22. 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.