EF3003, SF3003, DF3003
TROUBLESHOOTING
GUIDE
HEATER (CONTINUED)
Problem
Cause
Solution
Service Manual
Reference
Loose wiring
Trace wiring in unit
Page 9
Defective heater on/off switch Replace heater on/off switch Page 17
Heater fan runs
continuously
Defective heater assembly
Replace heater assembly
Page 18
NOISE
Problem
Cause
Solution
Service Manual
Reference
Dirty blower assembly
Clean blower assembly
Excessive noise
with the heater on
Defective blower assembly
Replace heater assembly
Page 18
Moving flame rod hitting or
rubbing against internal
components
Flame rod replacement
Page 15
Grinding or
excessive noise
with the heater off
Defective flame motor
Replace flame motor
Page 15
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