6 720 220 048
Revised 05-12 Subject to change without prior notice
29
CE Series
Troubleshooting
Insufcient
cooling or
heating
Unit undersized Recalculate heating and or cooling loads. If excessive, possibly adding
insulation and shading will rectify the problem
Loss of conditioned
air by leakage
Check for leaks in duct work or introduction of ambient air through
doors or windows
Airow Lack of adequate air ow or improper distribution of air. Replace dirty
lter
Refrigerant charge Low on refrigerant charge causing inefcient operation
Compressor Check for defective compressor. If discharge is too low and suction
pressure is too high, compressor is not pumping properly. Replace
compressor.
Reversing Valve Defective reversing valve creating bypass of refrigerant from discharge
of suction side of compressor. Replace reversing valve
Operating
pressures
Compare unit operation pressures to the pressure/temperature chart
for the unit.
TXV Check TXV for possible restriction or defect. Replace if necessary.
Moisture,
noncondensables
The refrigerant system may be contaminated with moisture or
noncondensables. Reclaim refrigerant, replace lter dryer, evacuate the
refrigerant system, and recharge with factory recommended charge.
Note: a liquid line dryer may be required.
UPM board
trouble
shooting
Compressor will
not run, no fault
blink code
Is Green
Power LED
light on and
no Red
Blink Code?
Yes
No
Is there
power to
the “Y” Call
(C-Y)?
No
Yes
Check
thermostat
settings and
configurations
for heat
pumps, and
wiring
Is there 24 V
power from
C to CC?
No
Yes
UPM Board
is Good
Check for Red
Blink Code.
If Red Blink
Code is not
present, replace
UPM Board
- Check all
power supplies
- Check all
safety switches
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