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noitcA esuaC elbissoP melborP
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.
Inoperative system switch or defrost
thremostat or outdoor thermistor or
electronic board
Check for continuity. Replace defective
component.
noitcA esuaC elbissoP melborP
Heating
insuffi 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 specifi 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.
HEAT PUMP TROUBLESHOOTING