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4. Troubleshooting
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SYMPTOM
DIAGNOSIS
REMEDY
Oven not
working
(No power,
No display)
*
Measure an input voltage
.
(240/120V
or 208/120V)
*
Measure an input voltage of terminal
block
.
*
Check circuit breaker
.
*
Check state of a wire connected to
Terminal Block
*
Measure supplied voltage at the
connector on main PCB L1~N : 120V
*
Replace or repair harness if loose or
disconnected
.
*
Make sure that the relay on Sub PCB
is working normally
*
Check whether connector between
sub , Wall Main PCB and New
FM Main PCB have been loose or
disconnected
.
* Replace sub PCB if relay has been
damaged or Sub PCB has been cracked
.
* Repair harness connecting to Wall Main,
New FM Main and Sub PCBs
* Make sure the wire harness is connected to
the relay on Sub PCB
*
Measure resistance of thermostat
terminals:
(normal : 0 ohoms)
*
Check whether harness connected
to terminal of a thermostat is loose or
disconnected
.
*
Measure voltage regulator
on main PCB
.
-
IC02 : 7812(DC 12V)
-
IC03 : 7805(DC 5V)
*
Replace the thermostat
.
*
Replace or repair harness
.
*
Replace or repair after check PCB
.
Oven temperature
rises slowly
.
*
Make sure wire harness connected
to broil, bake and convection heaters
is not loose or disconnected
.
*
Repair and replace harness
.
*
Disconnect terminals for each heater and
measure resistance, replace any heaters
with abnormal resistance
.
.
*
Make sure relays are operating
normally and PCB is not shorted
.
*
Replace or repair Wall Main PCB and New
FM Main PCB
.
Oven temperature
rises too fast
* Check if oven temperature rises over
400’F within 10 minutes in room
temperature
.
* Repair or replays shorted relays on Wall
Main, New FM Main or SUBs PCBs
* Check if oven harness has been
connected incorrectly or is shorted
* Replace or repair harness
.
* Make sure resistance of each heater
is within normal range
.
* Replace heater with abnormal resistance
range
.
