Amana GPCM3 Series Service And Troubleshooting page 51

Troubleshooting
Yes
No
Is there 24v at
compressor relay
coil?
Yes
Are relay
No
contacts closed?
Should read 0v at
pins 2 & 4
Yes
Is there 18-28vdc
No
at compressor
unloader plug
harness?
Yes
Does compressor
No
change from part load
to full load? Verified
by amp draw
Yes
Check for 24v
Does blower
No
between C &
change to 2nd
T1/2/3/4/5 terminals
stage heating
speed?
Yes
Are refrigerant
No
pressures and
superheat/subcooling
correct
Yes
No
at motor
Yes
Check for
Check for
No
No
leak in
restriction in
refrigerant
system
system
Yes
Yes
Check for restriction
or defective TXV
Repair Leak
Heat Pump - Heating (2 Stage)
Check thermostat & wiring
Replace relay
Replace unloader plug
Replace compressor
Check thermostat and wiring or
motor controller
Check blower motor
Verify refrigerant charge
Pressure test, evacuate and
recharge system
Pressure test, evacuate and
recharge system
Second stage heating operating
51