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EF3003, SF3003, DF3003
TROUBLESHOOTING GUIDE
HEATER
Problem Cause Solution
Service Manual
Reference
Defective heater on/off switch Replace heater on/off switch Page 17
Improper operation See User’s Guide
Heater is not
turning off
Loose wiring Trace wiring in unit Page 9
Defective heater on/off switch Replace heater on/off switch Page 17
Defective heater assembly Replace heater assembly Page 18
Improper operation See User’s Guide
Heater is not
turning on
Loose wiring Trace wiring in unit Page 9
Normal operation
Normal operation is when
the heater emits an odour for
a brief period after the
heater is initially turned on.
The heater is burning off any
dust accumulated during
manufacturing or operation.
Defective heater assembly Replace heater assembly Page 18
Heater emits an
odour
Loose wiring Trace wiring in unit Page 9
Improper operation See User’s Guide
Loose wiring Trace wiring in unit Page 5
Heater fan turns on
but heater lacks
heat
Defective heater assembly Replace heater assembly Page 18
Normal operation
Small glowing sections of
the element are considered
normal.
Heating element is
glowing red
Defective heater assembly
If larger glowing sections are
causing the heater to trip the
thermal cut out, unplug unit,
discontinue use and replace
heater assembly
Page 18