38
HEAT PUMP TROUBLESHOOTING
Possible Solution
Possible Solution
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Unit cools when
heat is called for
Incorrect wiring
Refer to applicable wiring diagram
Defective solenoid coil
Check for continuity of coil
Reversing valve fails to shift
Block condenser coil & switch unit to cooling.
Allow pressure to build up in system, then
switch to heating. If valve fails to shift, replace
valve.
Defective electronic control board
Replace electronic control board
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Heating
insuf
fi
cient
Heating capillary tube partially
restricted
Check for partially starved outer coil. Replace
heating capillary tube
Check valve leaking internally
Switch unit several times from heating to
cooling. Check temperature rise across
coil. Refer to speci
fi
cation sheet for correct
temperature rise
Reversing valve failing to shift
completely; bypassing hot gas
Deenergize solenoid coil, raise head pressure,
energize solenoid to break loose. If valve fails
to make complete shift, replace valve.
Summary of Contents for WallMaster WE10C33
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