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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6a
WINTERIZATION HEATER WILL NOT START - Continued
Step 8
Remove cables from solenoid valve and cover photoresistor with tape. Start heater and
look for spark after 15 seconds.
Replace ignition unit if no spark, (see para. 4-19).
Step 9
Using voltmeter check for a minimum of 9 volts at connector B, terminals 1 and 2.
NOTE
Refer to marking on control unit for terminal identification.
If voltage, replace wiring. If no voltage, replace unit, (see para. 4-19).
Step 10
Check electrode gap.
Adjust gap as required, (see para. 4-19).
Step 11
Photoresistor faulty.
Replace photoresistor, (see para. 4-19).
6b
COMBUSTION STARTS BUT GOES OUT AFT ER 15 SECONDS
Photoresistor faulty.
Replace photoresistor, (see para. 4-19)
6c
NO OR LOW POWER TO HEATER
Step 1
Check circuit breaker.
Replace circuit breaker if open circuit.
Step 2
Check truck batteries discharged.
Recharge or replace batteries.
Step 3
Check wire from circuit breaker to winterization heater.
Replace if broken.
4-34
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