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TM5-4120-377-14
l Problem with equalizing solenoid valve.
l Problem with pressure regulating valve.
l Internal compressor damage.
(3) Suction pressure too low.
Possible causes:
l Dirty return air filter.
l Discharge or return air louvers closed.
l Partially blocked discharge or return air ducts or openings.
l Dirty evaporator coil.
l Cold return air.
l Low refrigerant charge.
l Liquid solenoid valve closed.
l Fan motor not operating.
l Evaporator fan loose on motor shaft.
l Problem with expansion valve operation.
l Expansion valve superheat too high.
l Plugged or kinked distributor tube.
l Suction line or evaporator coil tubing restriction.
l Clogged dehydrator (filter-drier).
l Moisture in refrigerant system.
(4) Suction pressure too high.
Possible causes:
l High return air temperature.
l Open equalizing solenoid valve.
l Compressor not running.
l Expansion valve bulb damage or poor contact with suction line.
l Internal compressor failure.
l Problem with liquid quench expansion valve.
l Problem with regulating valve.
l Problem with expansion valve.
5-20
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