Question about Heating & Cooling
My switch board sounds like its working. I get the glow for ignition. No gas coming through. Valve is open
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Posted on Jan 02, 2017
OK, if the furnace is not lighting for even a few seconds, you have either a bad gas valve, bad wire, bad control module or no gas. The pressure switch is not the issue. Check all wires to the gas valve and look for 24 volts across them when the ignitor glows and you hear the click. Then test for 24 volts to ground. It could be a bad ground wire.
Posted on Oct 21, 2008
SOURCE: won't srtart
Check at the gas valve to see if you are getting power to the terminals after you hear the click shortly before the ignitor stops. If no voltage ...replace the board.
induction fan on, if pressure switch is reading ok condition---->
Ignitor is powered for up to 20 seconds (depends on model) ----->
Gas valve is energized ----> if flame is present everything just works away, if no flame in 3 seconds sequence starts over for set number of tries or continuously (again depending on the model)
Hope this helps
if 23/27 volts is present at gas valve then replace valve but bad valve is not very common usually, its the board.
Posted on Nov 14, 2008
Test while the unit is firing with a meter. you should have 24 volts going to gas valve. If you do and no gas is coming out, you have a bad gas valve. You will need a gas pressure test kit to install a new one correctly.
Posted on Dec 01, 2008
You have a limit switch open. See if you can see any little button switches with 2 wires going to it, check all these for continuity
Posted on Nov 01, 2009
Tips for a great answer:
Jun 10, 2011 | White Rodgers Water Heaters
oven control supplies voltage to the oven igniter/gas valve circuit. When the
oven control is set to Bake, voltage is supplied to the oven igniter which
should glow bright red to almost white hot. Once the igniter comes on and
begins to glow it must pull enough current to cause the gas valve to open so
the burner can ignite from the igniter. I added an image below with the theory
of operation. Click this link:--http://media.fotki.com/1_p,swbbsqrsgstsqkkxgtqsskgwtqkq,vi/wrgtsbrktxwdfwfbgdg/1/1303472/5961857/image5576034710104836299img-or.png
the broiler drawer and then set the oven control to bake and watch to see if
the glow bar igniter glows or not. If it does not glow, the failure could be a
broken Igniter, failed oven control board or gas valve. If the igniter is
glowing red, then it can be possible that gas valve is faulty. To see how
igniter looks. See the fig below:--
To order this part click the link below:--
Also to confirm, check to see if the igniter is getting 120 volts
when it's turned on. If it gets 120 volts, then your safety gas valve is bad
because it's not letting the neutral go through. Otherwise, if it's NOT getting
120 volts, your control board shorted out and you need a new control board.
But as you mentioned that control board is replaced. So igniter should get 120 volts. If valve is faulty. But if igniter is not glowing then its faulty igniter confirmed.
To see how gas valve looks,
please click the link below:---
In most of the cases the igniter is faulty, because gas
valve getting faulty is very rare. But still getting the voltages checked, will
confirm. These will help. Thanks. Helpmech.
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