
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Electric Standby Diagnosis
Condition
Possible Cause
Remedy
Unit turned ON—LCD Blank
Battery discharged
Charge or replace battery
Faulty battery cable connections
Clean battery cables
Fuse FS8 blown
Check for short circuit and replace
fuse
Fuse F2, F8, or F12 blown
Check for short circuits and replace
fuse
Open circuit
Check HMI Harness
Unit turned ON and LCD
backlight ON but motor will not
start and run
Diesel operation selected
Select ELECTRIC
Unit in NULL
Check setpoint and box temperature
Fuse F25 blown
Check for short circuit and replace
fuse
Faulty HPCO
Check HPCO
Open or faulty overload relay
Determine cause and rest or
replace overload relay
Faulty PSM
Check PSM
Faulty motor contactor
Check motor contactors
Open circuit
Check 8, ER, EOL, 7E, 7EB, 7EC,
CH, L1, L2, and L3 circuits
Faulty drive motor
Check drive motor
Faulty electric standby power
source
Check electric standby power
source
Evaporator heaters do not heat
Faulty heater contactor
Check heater contactor
Open circuit
Check 7E, 26E, L1, L2, L3, H1A,
H2A, and H3A circuits
Faulty heaters
Check heaters