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P
o r
b
e l
m
Unit cools when
heat is called for
P
o r
b
e l
m
Heating
insuffi cient
38
HEAT PUMP TROUBlESHOOTING
P
o
s
s
b i
e l
C
a
u
s
Incorrect wiring
Defective solenoid coil
Reversing valve fails to shift
Inoperative system switch or defrost
thremostat or outdoor thermistor or
electronic board
P
o
s
s
b i
e l
C
a
u
s
Heating capillary tube partially
restricted
Check valve leaking internally
Reversing valve failing to shift
completely; bypassing hot gas
e
Refer to applicable wiring diagram
Check for continuity of coil
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.
Check for continuity. Replace defective
component.
e
Check for partially starved outer coil. Replace
heating capillary tube
Switch unit several times from heating to
cooling. Check temperature rise across
coil. Refer to specifi cation sheet for correct
temperature rise
Deenergize solenoid coil, raise head pressure,
energize solenoid to break loose. If valve fails
to make complete shift, replace valve.
A
t c
o i
n
A
t c
o i
n
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