Just got married and the wife is pissed already... Dryer stopped heating on any program overnight. The unit is a GAS powered 7 y/o LG DLG2524W. Nothing changed/moved. It spins, completes all programs but it simply does not heat.
There is enough ventilation, no lint in the filter, no clogging etc. Gas is connected and source pipe goes to water heater too which does work
Found the service manual here: DLG2524W Service Manual
It lists some self tests (press 'more/less time' icw 'power'). Then you hit START button a couple of times for different tests, but it never gets that far. Mine circles between 19:H0 and U01 and that's it. Nothing happens when I hit START to perform the other tests. Obviously this error code isNOT listed in the manual
Found one post where it turned out to be a faulty flameswitch flame switch/sensor
Found another one where the main board was suspected (unconfirmed) Faulty board?
I've opened the unit & performed the following tests:
1) Measured thermostat (M220) and hi limit thermostat (M230) both showed 0 Ohm -> Should be OK
2) Based on 'Gas valve test'*
I replaced the M230 but no change
3) Measure resistance of ignitor and flame sensor, both are 0 Ohm -> should be OK
4) Measured resistance of both GAS valve coils (disconnect terminals), both are in the 1150-1180 Ohm -> should be OK
Removed the front panel which holds the door while leaving DOOR switch connected. The drum is still in place and can rotate. And indeed, if I start the unit it will spin. The ignitor will glow deep orange for a few seconds before switching off again, it tries again in a couple of minutes but the gas never fires. I do not hear any clicks on the GAS valves.
This is someone's video where you see how the firing sequence works, but in his case the gas keeps flowing with ignitor off, which is very dangerous. Hard to judge by the video, but his ignitor seems whiter, whereas mine is a deep yellow/orange.
I measured the voltage in both AC and DC (the manual/forums are unclear on AC or DC) of the 2 terminals connecting to the GAS VALVES and I never get above 1 volt.
Disconnecting mains will bring this to 0 completely.
Some questions I had.
1) What/who controls the voltage on these terminals?
2) At what stage to expect the voltage to be [ 40 - 90 Volts AC/DC ]?
a) With the unit plugged in but not powered up?
b) With the unit powered up but no program selected
c) When a program is running
d) When a program is running and the ignitor glows?
e) With a program running with actual wet clothes in the dryer such that the moisture sensor detects wetness?
I've measured the power going to VALVE 1 when running a program. Valve 2 is harder to get to but I suppose I could disconnect it. VALVE 1 does show slight voltage change when the ignitor lits up, but again, never reaches anywhere near the 40 - 90 volts I am guessing it needs?
Similar issues with slighty different variations:Board DefectBoard replacement didn't resolveUnstable hi limit thermostatBurner sequence, suggesting 90V should be measurable at coilsPoster also looking for more detailed sequence of what should be measuring at what pointGetting only 20 V on the coilsLong chat, same symptoms, guy replaced board but still 50V
Sorry for this lenghty post. I hope someone can give me some hints. I am suspecting a bad board at this point ($100) but would like to test some more.
Thanks & I will post once resolved