Test 6 Heater Switch Test - Electric Type - LG DLEX4270 /01 Series Service Manual

Test 6
Heater Switch Test - Electric Type
Caution
Trouble
Symptom
Measurement
Condition
BK YL3
WH
YL3
BK WH
Others
TH3
TH2
L2(Red) L2S(White)
Before measuring resistance, be sure to turn the power off, and do voltage discharge.
(When discharging, contact the metal plug of the power cord with a ground line.)
While operating, Heating will not work. Drying time takes longer.
After turning the power off, measure the resistance.
Enter diagnostic mode and press the
START/PAUSE button twice. Measure the
voltage between YL3-
on the black tab relay. Is the voltage 240 VAC?
Disconnect the YL3, black tab relay and white tab relay
connectors at the main PCB.
Measure the resistance between YL3-
BL wire on the black tab relay connector.
Is the resistance 18-22 ?
Measure the resistance between YL3-
(WH) and the YL wire on the white tab relay
connector. Is the resistance 18-22
Measure the resistance between the BL wire on the
black tab relay and the YL wire on the white tab
relay connectors. Is the resistance 36-44
Measure the resistance between terminals 1
(RD) and the heater housing.
Is the resistance <1 ?
Refer to the hi-limit thermostat and
thermal cut off component tests.
Only for FLOW SENSE model
L2D(White)
TH3
TH2
L2
(Red)
L2S(White)
(WH) and the YL wire
YES
(WH) and the
YES
?
YES
?
YES
YES
Wires
L2(Red)
L2D(White) : Go to the duct(YL3 in main pcb)
L2S(White) : Go to the safety.
43
43
FOR LG TECHNICIAN
• Check power supply.
NO
• Check wiring and
connectors to
the element.
NO
• See element
component test.
• Check wiring and
connectors
to the element.
NO
• See element
component test.
• Check wiring
and connectors to the
element.
NO
• See element
component test.
• Replace the
NO element.