LG DLEX3900 Series Service Manual page 45

Test 7
Caution
Trouble Symptom
Measurement Condition
Valve 1
Valve 2
NOTE: When the gas valve operates after disassembling, ignition will be off several seconds.
It is normal because there is no circulation of air
When measuring power, be sure to wear insulated gloves to avoid electric shock.
While operating, heating will not work.
Drying time takes longer
With dryer power on
Power on & start (Normal cycle)
When measuring Valve 1 voltage,
is the valve at least 90 V DC?
Igniter operates?
(after 1 minute, igniter becomes reddish)
When measuring Valve 2 voltage, value is more
is the valve at least 90 V DC? (10 sec after igniter off)
When measuring terminal resistance on valve 1 and
valve 2, valves are more than1.5 ~ 2.5 k
(Measure after off )
If valve 1 and valve 2 read less than 10 V DC, are the
valves off?
• Harness check
• Controller change
NO
YES
YES
NO
?
NO
YES
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45
• Check thermostat
NO
hi-limit safety
• Check Igniter and
NO
frame detect
• Check gas
connection or
YES
gas supply
YES
• Change valve
NO
• Change valve