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8-4. Troubleshooting with
Symptom
<Electric Dryer>
Symptom
Check Point
1. Not heating
1.Check Electric Wiring.
2.Check the motor operation.
3.Voltage of the Main PWB.
4. Check Heater element’s Resistance.
Component
Picture
Test Point
Value
Main PWB
Tab r
elay(B)④-YL3①
Tab r
elay(W)④-YL3①
Measure voltage of connector to connector
① Heating
②
Stop
①
Voltage value = 240Vac
②
Voltage value = 0
Hea
ter
Measure resistance of the following
ter
minal ①
Terminal: 1(C
OM) - 2 ②
Termi
-
nal: 1(C
OM) - 3 ③
Ter
minal: 2 – 3
①
Resistance v
alue = 10Ω
②
Resistance v
alue = 10Ω
③
Resistance v
alue = 20Ω
Ther
mostat(Hi-limit)
Measure resistance of terminal to terminal
① Open at 257 ± 9℉ (125 ± 5℃) ② Close at
221 ± 9℉ (94 ± 7℃)
①
Resistance v
alue ≒ ∞
②
Resistance v
alue < 5Ω
Thermostat(Safety)
Measure resistance of terminal to terminal
① Open at 284 ± 41℉ (140 ± 5℃) ② Au
to
r
eset -31℉ (-35℃)
①
Resistance v
alue ≒ ∞
②
Resistance v
alue <5Ω
Motor (Centrifugal
Switch)
Measure resistance of the following
ter
minal: 1 - 2
①
Resistance value =
30mmΩ
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