CSR-20 & CSR-40, September 1999
Mechanical Diagnosis 8-5
Condition Possible Cause Remedy
Evaporator fan motor(s) Unit on defrost Check operating mode indicator lights
does not operate
Unit in Economy Mode (Frozen Load; Check setpoint, indicator lights and
Null mode ONLY) Program menu of µP-D controller to verify
that Economy Mode is set to ON
Loose line connection Tighten connections
Open motor internal thermal Check for seized bearings or defective
overload protector thermal overload protector. Repair or
replace as necessary
Defective motor Replace motor
Defective low or high speed Replace defective contactor
evaporator fan contactor
No low or high speed evaporator Diagnose and replace output module or
fan output signal from controller controller
output module
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