KDS6401E
TROUBLESHOOTING GUIDE
HEATER (CONTINUED)
Problem
Cause
Solution
Service Manual
Reference
Heater fan runs
continuously
Loose wiring
Trace wiring in unit
Page 7
Defective heater On/Off
switch
Replace heater On/Off
switch
Page 11
Defective heater assembly
Replace heater assembly
Page 14
NOISE
Problem
Cause
Solution
Service Manual
Reference
Excessive noise
with the heater on
Dirty blower assembly
Clean blower assembly
Defective blower assembly
Replace heater assembly
Page 14
Grinding or
excessive noise
with the heater off
Moving flame rod hitting or
rubbing against internal
components
Flame rod replacement
Page 10
Defective flame motor
Replace flame motor
Page 10
18