Heartland Appliances Metro Service Manual page 15

Problem Diagnosis Charts
Models 3520/3525; 3620/3625 & 3620B/3625B
Problem
19. Timer blank or flashing during
cooking or after completion of
cooking cycle
20. Cooling Fan not working
21. Cooling Fan stays in on position
for several hours
22. Top burner does not ignite
23. Top burner on high at any
setting
Possible Cause
•
House breaker tripped or fuse
blown
•
No power to timer - defective
coaxial power supply cable
•
Defective timer
•
Cooling fan inoperative or
blocked - timer's temperature
safety limit tripped
•
Defective relay board
•
36" models only. Defective 25
amp relay or wiring between
relay to terminal block or relay
board.
•
No power to cooling fan
•
Cooling fan stuck with foreign
material
•
Faulty fan limit
•
Self Clean Latch not fully
retracted
•
No gas to burner
•
Faulty ignition switch
•
Open wire to ignition switch
•
Burner valve stem cannot be
turned
•
Open wire from ignition switch
to spark module
•
Spark module defective
•
Electrode dirty or defective
•
Burner valve defective
•
Too much gas pressure
•
Regulator defective
15
Section 4
Repair/Test Procedure
Check Power supply
(Procedure 1)
Check coaxial cable
(Procedure19)
Check timer (Procedure 4)
Check cooling fan limit
(Procedure 20)
Check relay board (Procedure
18)
Check 25 amp relay (Procedure
21)
Check cooling fan (Procedure
20)
Check cooling fan (Procedure
20)
Check cooling fan (Proc 20)
Check door latch mechanism
(Procedure 17)
Check gas supply (Procedure
24)
Check burner valve (Procedure
29)
Check ignition switch
(Procedure 23)
Check wiring and connections
(Procedure 23)
Check burner valve (Procedure
29)
Check ignition switch
(Procedure 23)
Check spark module
(Procedure 22)
Check wiring and connections
(Procedure 22)
Check spark module
(Procedure 22)
Check burner electrode
(Procedure 28)
Replace burner valve
(Procedure 29)
Check gas supply (Procedure
24)
Check regulator (Procedure 25)
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