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30 cP/BP series
Insufficient
Unit undersized
cooling or
heating
Loss of conditioned
air by leakage
Airflow
Refrigerant charge
Compressor
Reversing Valve
Operating
pressures
TxV
Moisture,
noncondensables
UPM board
Compressor will
not run, no fault
trouble
blink code
shooting
6 720 220 045
Recalculate heating and or cooling loads. If excessive, possibly
adding insulation and shading will rectify the problem
Check for leaks in duct work or introduction of ambient air
through doors or windows
Lack of adequate air flow or improper distribution of air.
Replace dirty filter
Low on refrigerant charge causing inefficient operation
Check for defective compressor. If discharge is too low and
suction pressure is too high, compressor is not pumping
properly. Replace compressor.
Defective reversing valve creating bypass of refrigerant from
discharge of suction side of compressor. Replace reversing
valve
Compare unit operation pressures to the pressure/temperature
chart for the unit.
Check TxV for possible restriction or defect. Replace if
necessary.
The refrigerant system may be contaminated with moisture
or noncondensables. Reclaim refrigerant, replace filter dryer,
evacuate the refrigerant system, and recharge with factory
recommended charge.
Is there
power to
Yes
the "Y" Call
(C-Y)?
Is Green
Power LED
light on and
no Red
Blink Code?
- Check all
No
power supplies
- Check all
safety switches
Subject to change without prior notice
troubleshooting
Yes
Is there 24 V
Yes
power from
C to CC?
No
Check
present, replace
thermostat
settings and
No
configurations
for heat
pumps, and
wiring
UPM Board
is Good
Check for Red
Blink Code.
If Red Blink
Code is not
UPM Board
Revised 05-12
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