AL03 Loss of Superheat Control

Cause
  • Superheat has remained below 1.66 C (3 F) degrees for five minutes continuously while compressor running. Compressor drawing more than 2.0 amps, compressor pressure ratio is greater than 1.8, and Electronic Expansion Valve (EEV) is at 0% open.
Components Troubleshooting Corrective Actions
Electronic
Expansion Valve
(EEV)
Check the operation of the
EEV using Cd41.
Replace EEV if
Defective.
Evaporator
Temperature
Sensor(s) ETS &
ETS1.
Verify accuracy of
temperature sensors, refer
to Sensor Checkout
Procedure Section 6.24.
Replace ETS or ETS1 if
Defective.
Evaporator Fans Confirm fans operating
Properly.
Replace fan(s) if
defective, refer to
EVAPORATOR FAN
MOTOR ASSEMBLY
Section 6.15.