HP - C 5
Electronic Expansion Valve (EEV) Test
EEV is not sensing that the compressor is ON and in the Heat Mode.
1.) Check plug & harness at J6.
2.) Verify 24VAC at Y1 and/or Y2 inputs to EEV control J6 are
present (not “O”) See Table 1.
System is very low on charge.
1.) Check charge per Service Facts.
EEV valve is stuck closed.
1.) See for Open Valve Test.
EEV valve is stuck open.
1.) See Closed Valve Test.
Sensors are out of calibration.
1.) Verify sensors are accurate.
High superheat
(low suction pressure)
in heating mode
System is low on charge.
1.) Check charge per Service Facts.
Sensors are out of calibration.
1.) Verify sensors are accurate.
EEV valve is stuck closed.
1.) See Open Valve Test.
EEV hunting
(Suction pressure moves
up & down)
Sensors are out of calibration.
1.) Verify sensors are accurate.
Verify temperature sensor is clipped tight
to suction line and insulated.
Verify Outdoor unit:
1.) Is free and clear of ice and debris.
2.) Has adequate clearance.
3.) Distributor tubes are not bent or kinked.
System is pumping down
in heat mode
Low superheat (flooding)
in heating mode
Troubleshooting Flow Chart
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