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BOREAL® ACDX Heat Pump Trouble Shooting Guide
Fault
Possible Cause
Compressor not
Power Failure
operating
Disconnect switch open
Fuse blown
Low voltage
Burned out motor
Thermal overload on com-
pressor tripped.
Faulty compressor contactor. Voltage on line side with contactor
Seized compressor due to
locked or damaged mecha-
nism.
Faulty run capacitor.
2005 Boreal Geothermal Inc.
Verification
Electric circuit test shows no voltage
on the line side of compressor con-
tactor.
Voltmeter shows no voltage on the
line side of the compressor contactor.
At heat pump disconnect box, volt-
meter shows voltage on the line side
but not on the load side.
Voltmeter shows abnormally low
voltage (Below 210 v) at heat pump
disconnect switch.
Ohmmeter shows no resistance be-
tween common and run terminals or
between common and start terminals.
Note: Be sure compressor overload
has had a chance to reset. If comp. is
hot this may take several hours.
Ohmmeter shows reading when
placed across R and S terminals and
infinity between C & R or C & S.
Make sure the internal overload has
had time to reset.
held closed, but no voltage on one or
both terminals on the load side.
Points pitted or burned.
Compressor attempts to start but
trips it's internal overload after a few
seconds.
Check with ohmmeter for shorts,
open etc.
www.boreal-geothermal.com
Recommended Action
Check for blown fuse at heat pump's
disconnect box or blown fuse
Determine why the disconnect
switch was opened, if all is OK close
the switch.
Replace fuse with proper size and
type. (Time-delay) type "D"
Check total load on system.
Call power company.
Determine cause and replace motor.
If windings are open or overload is
faulty, replace compressor.
Replace contactor.
Attempt to "rock" compressor free.
If normal operation cannot be estab-
lished, replace compressor.
Replace if faulty.
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