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NO HEATING OR
INSUFFICIENT
HEATING
COMPRESSOR
WILL NOT RUN
CONTACT
OPEN
DEFECTIVE LOW-
VOLTAGE
TRANSFORMER
REMOTE
CONTROL
CENTER
DEFECTIVE
CONTACTOR
COIL OPEN OR
SHORTED
OPEN INDOOR
THERMOSTAT
LIQUID-LINE
PRESSURE
SWITCH OPEN
LOSS OF
CHARGE
OPEN CONTROL
CIRCUIT
CONTACTOR
CLOSED
COMPRESSOR
POWER SUPPLY
LOOSE LEADS AT
COMPRESSOR
FAULTY START
GEAR (1-PH)
COMPRESSOR
STUCK
COMPRESSOR
INTERNAL
OVERLOAD
OPEN
OPEN SHORTED
OR GROUNDED
COMPRESSOR
WINDINGS
DEFECTIVE RUN
CAPACITOR
DIRTY FILTERS
OR INDOOR
COIL
INDOOR FAN
STOPPED OR
CYCLING ON
OVERLOAD
DAMAGED
REVERSING
VALVE
RESTRICTION IN
DISCHARGE LINE
OVERCHARGE
OR NON-
CONDENSABLES
IN SYSTEM
LOW
REFRIGERANT
CHARGE
LINE VOLTAGE
TOO HIGH OR
LOW
DEFECTIVE RUN
CAPACITOR
(1-PH)
COMPRESSOR
BEARINGS
HIGH-LOAD
CONDITION
REVERSING
VALVE JAMMED
IN MIDPOSITION
HIGH
SUPERHEAT
DEFECTIVE FAN
MOTOR
CAPACITOR
LOOSE LEADS
AT
FAN MOTOR
FAN MOTOR
BURNED
OUT
LOW SUCTION
LOW HEAD
OUTDOOR FAN
STOPPED
LOOSE LEADS
AT OUTDOOR
FAN MOTOR
INTERNAL FAN
MOTOR KLIXON
OPEN
FAN MOTOR
BURNED OUT
DEFROST RELAY
N.C. CONTACTS
OPEN ON
CIRCUIT BOARD
REVERSING
VALVE DID NOT
SHIFT
UNIT NOT
PROPERLY
CHARGED
OUTDOOR FAN
RUNNING
REVERSING
VALVE STUCK
RESTRICTED
LIQUID LINE
PISTON
RESTRICTED OR
IS CLOGGED
UNDER-
CHARGED
OUTDOOR COIL
DIRTY
STRAINER
RESTRICTED
OUTDOOR COIL
HEAVILY
FROSTED
DEFECTIVE
DEFROST
THERMOSTAT
DEFROST
THERMOSTAT IN
POOR PHYSICAL
CONTACT WITH
TUBE
DEFECTIVE
CIRCUIT BOARD
BAD ELECTRICAL
CONNECTION
ANYWHERE IN
DEFROST
CIRCUIT
STRIP HEATERS
NOT OPERATING
OUTDOOR
THERMOSTAT
DEFECTIVE
ODT SETTING
TOO LOW
CAP TUBE
PINCHED OR
BULB NOT
SENSING TRUE
ODT
STRIP HEATER
RELAY OR
CONTACTOR
DEFECTIVE
OPENING IN
POWER CIRCUIT
TO HEATER
ELEMENTS
BROKEN FUSE
LINK
BROKEN
HEATER
ELEMENT
OPEN (KLIXON)
OVER
TEMPERATURE
THERMOSTAT
DEFECTIVE
ROOM
THERMOSTAT
(2ND STAGE)
COMPRESSOR
RUNS BUT
CYCLES ON
INTERNAL
OVERLOAD
COMPRESSOR
RUNS
INSUFFICIENT
HEATING
FAN MOTOR
CONTACTS
WELDED CLOSED
IN DEFROST
RELAY
DEFECTIVE
START
CAPACITOR
DEFECTIVE
START
CAPACITOR
HEAT PUMP
TROUBLESHOOTING HEATING CYCLE
A90206
Fig. 60 – Heat Pump Troubleshooting -- Heating Cycle