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16.7 SERVICE ANALYZER CHART
COMPRESSOR OVERHEATING
SYMPTOMS POSSIBLE CAUSE CHECK/REMEDIES
High superheat Low charge Check system charge
Faulty metering device Restricted cap tube, TEV (TXV)
Power element superheat
adjustment
Foreign matter stopping flow
High internal load Hot air (attic) entering return
Heat source on; mis-wired or
faulty control
Restriction in liquid line Drier plugged
Line kinked
Low head pressure Low charge
Operating in low ambient
temperatures
Suction or liquid line subjected Hot attic
to high heat source
Hot water line
Low voltage Loose wire connections Check wiring
Dirty or pitted compressor Replace contactor
contactor contacts
Power company problem, Have problem corrected before
transformer diagnosis continues
Undersized wire feeding unit Correct and complete diagnosis
High voltage Power company problem Have problem corrected
High head pressure Overcharge Check system charge
Dirty heat pump coil Clean coil
Faulty or wrong size Replace fan motor
heat pump fan motor
Faulty fan blade Replace fan blade
or wrong rotation
Replace with correct rotation motor
Recirculation of air Correct installation
Additional Heat Source Check for dryer vent near unit
Check for recirculation from
other equipment
Non-condensibles Recover refrigerant, Evacuate and
recharge system
Equipment not matched Correct mis-match
Short cycling of compressor Faulty pressure control Replace pressure control
Loose wiring Check unit wiring
Thermostat Located in supply air stream
Differential setting too close
Customer misuse
TEV Internal foreign matter
Power element failure
Valve too small
Distributor tube/tubes restricted
Capillary tube Restricted with foreign matter
Kinked
I.D. reduced from previous
compressor failure
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