LG DLEX4370 Series Service Manual page 26

Not heating (Gas)
Check lint Filter
Clean if needed.
Explain to owner responsibility to
and safety reason.
No
Run dryer on a heat cycle for
one minute.
If heat is felt, unit may have a
vent problem, Investigate venting
system.
Is vent too long?
Fully or partially clogged, etc?
No
Check voltage of connector to
connector
CAUTION: Potential for voltages
over 100Vac. Proceed with care.
Igniting = 120Vac ± 10%
Stop = 0
Yes
Unplug UNIT /
Check the gas valve nozzle
clogged.
Troubleshooting
Yes
for inadequate
Defective main
No
PCB
Remove foreign
body.
Unplug UNIT / Check gas valve
Valve1 terminal >
1.5kΩ~2.5kΩ
Valve2 terminal >
1.5kΩ~2.5kΩ
Yes
Unplug UNIT / Check Igniter
Resistance value = 50~800Ω
Yes
Unplug UNIT /
Open at 370 (Maximum)
∞
Close at 320
1Ω
Yes
Unplug UNIT / Test thermostats
Hi-limit
Open at 203 ± 41
(95 ± 5 ) ∞
Close at 158 ± 41
(70 ± 5 5Ω
Safety
Open at 230 ± 41
(110 ± 5 ) ∞
Close – Manual reset
Yes
Retest heating circuit
26
Defective gas
No
valve
Defective Igniter
No
Defective Flame
No
detector.
Defective
No
Thermostat. If
Safety thermostat
Is open, replace
Both after
Determining what
Caused thermo-
stat
to open