9-1-3. The Digital Tube display “F4”
Error message:Heater is abnormity .
Troubleshooting:
Cut off the power. check if the power
line is well and connected properly
Replace the power line
or
Connect the power wire properly
Connect the wire properly
Replace the heater
Check if the wire connecting of the
heater,
the PCB, the Relay and related
wiring is disconnection?
SERVICE MANUL
Model No.HLTD500ACW
Issue
Rev.
- 23 -
Broken
N
Well
Y
Y
N
Check if the heater is burned out? You can
look or use ohmmeter.
Well: the resistance is about 11 ;
Broken: the resistance is infinite.
Check if the wire connecting of the
hi-limit thermostat
is disconnection
Check if the hi-limit thermostat is well.
Well: the resistance is 0
;
Broken: the resistance is infinite.
Y
Connecting the wire properly
Well
Broken
N
Replace the hi-limit thermostat
****
com
****
com
Check if the wire unit is good
Check if the Power PCB and Display PCB
is good?
Well
Replace the Power PCB or Display PCB
Broken
Check if the centrifugal switch of the motor
is good
Well
Replace the motor
Broken
Replace the wire unit
N