48
4. Troubleshooting
SYMPTOM
DIAGNOSIS
REMEDY
oven not operating
(No power,
No display)
*
Measure an input voltage. (240/120V
or 208/120V)
*
Measure an input voltage of terminal
block .
*
check circuit breaker .
*
Make sure that the state of wire is
connected with Terminal block .
*
Measure voltage of
connector(CN08,CN09) on main
PCB L1~N : 120V
*
Measure secondary voltage of Low
Voltage Transformer .
Red + Red color : 13.5V
Yellow color : 8V
*
Replace of repair if harness has been
loosen or disconnected .
*
Replace if resistance of Low voltage
transformer primary coil is over MΩ.
(Thermal Fuse out)
*
Make sure that the relay on sub PCB
is being worked normally .
*
Make sure whether harness between
connector (CN04,CN05) on sub
PCB and connector (CN04,CN05)
on main PCB has been loosen or
disconnected .
*
Replace sub PCB if relay has been
damaged or there is any cracking on the sub
PCB .
*
Repair harness is connected main PCB with
sub PCB .
*
After confirming whether harness has been
inserted into relay on sub PCB or not, take
action follow as;
-
Replace or repair harness .
-
Replace or repair sub PCB .
*
Measure resistance both ends of
terminal on thermostat .
(normal : 0 ohoms)
*
Check whether harness is connected
terminal on thermostat has been
loosen or disconnected .
*
Measure voltage regulator
(IC02,IC03) on main PCB .
-
IC02 : 7812(DC 12V)
-
IC03 : 7805(DC 5V)
*
Replace the thermostat .
*
Replace or repair harness .
*
Replace or repair after confirming the state
of working of main PCB .
Oven temperature
is risen slowly .
*
It will display “E-08” if it fail to reach
100˚F(38˚C) within 10 minute in a
state of room temperature .
*
Replace after checking whether there is
any problem with oven sensor .
(1080Ω at the Room temperature)
*
Make sure whether harness is
connected with Broil, Bake and
convection heater has been loosen
or disconnected .
*
Repair and replace harness .
*
Make sure whether Broil, Bake,
and convection heater has been
disconnected .
*
After taking out terminal from each heater,
measure resistance of heater and then
replace that if it is not a normal resistance
value .
*
Make sure that heater relay and
pattern on sub PCB .
*
Replace or repair relay .
*
Replace or repair sub PCB .
