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Electronic Expansion Valve (EEV) Troubleshooting
Flowchart
System is pumping
down in heat mode
Low superheat
(flooding) in heating
mode
High superheat
(low suction pressure)
in heating mode
EEV Hunting
(Suction pressure
moves up & down)
4TWL9048A-SF-1C-EN
Using the CDA, verify the following:
1. SYSTEM STATUS is HEATING in the
home screen.
2. SOV position is HEAT and
EEV position is greater than step 56
in the Monitor menu.
System is very low on charge
1. Check charge per Service Facts
EEV valve is stuck open
1. Verify operation with the
Close Valve Test found in the
CDA Control menu.
Sensors are out of calibration
1. Verify sensor values in the CDA Monitor
menu. For sensor accuracy test, compare
sensor values to charts found in the Service
Facts.
System is low on charge
1. Check charge per Service Facts
Sensors are out of calibration
1. Verify sensor values in the CDA Monitor
menu. For sensor accuracy test, compare
sensor values to charts found in the Service
Facts.
Sensor are out of calibration
1. Verify sensor values in the CDA
Monitor menu. For sensor accuracy
test, compare sensor values to
charts found in the Service Facts
Verify temperature sensor is
clipped tight to suction line
and insulated
EEV Valve is stuck closed
1. Verify valve operation with the
Open Valve Test found in the CDA
Control menu.
EEV valve is stuck closed
1. Verify valve operation with the
Open Valve Test found in the CDA
Control Menu
Verify Outdoor Unit:
1. Is free and clear of ice and debris
2. Has adequate clearance
3. Distributor tubes are not bent
or kinked
41
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