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Joined: Mar 2005
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Campfire Ranger
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OP
Campfire Ranger
Joined: Mar 2005
Posts: 17,527 |
Natural gas Lennox....
Receiving call for heat.
Inducer fan kicks on.
Ignitor glows orange.
No gas being released.
Measured 27 volts off wires to gas valve once ignitor glows...
Safe to say bad gas valve assembly?
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Joined: Dec 2012
Posts: 801
Campfire Regular
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Campfire Regular
Joined: Dec 2012
Posts: 801 |
Do you hear a click from the pressure switch to it let the gas flow?
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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OP
Campfire Ranger
Joined: Mar 2005
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Yeah, I hear a click, then get voltage on two wires that go to valve. I thought it could be pressure switch, but wouldn't there be no voltage if so?
I put meter on pressure switch set to ohms. Shows open, then once inducer kicks on the circuit closes. I believe that is correct?
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Joined: Jan 2021
Posts: 5,569
Campfire Tracker
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Campfire Tracker
Joined: Jan 2021
Posts: 5,569 |
How old is the furnace? So far I agree with you on the gas valve. I had one that went bad about 8yrs ago that was 20yrs old. I replaced it with a heat pump and have a propane stove for backup.
ΜΟΛΩΝ ΛΑΒΕ
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Joined: Dec 2012
Posts: 801
Campfire Regular
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Campfire Regular
Joined: Dec 2012
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Sounds like thats not the problem then. The pressure system always seems to be the issue on either our furnaces or the ones in my rental units. I'll have to defer to the experts then. Good luck, Dave
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Joined: Feb 2017
Posts: 8,076
Campfire Outfitter
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Campfire Outfitter
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Gas valve or gas pressure, you should be getting an error code on the circuit board.
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Joined: Jan 2010
Posts: 23,524
Campfire Ranger
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Campfire Ranger
Joined: Jan 2010
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on my American standard I'm pretty sure if my pressure valve isn't working, the ignitor doesn't even come on.
About every 3 years I have to screw around with and clean out the lines. This year I had rice weevils in it of all things
have you paid your dues, can you moan the blues, can you bend them guitar strings
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Joined: Jan 2005
Posts: 38,810
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2005
Posts: 38,810 |
Andy Anders's furnace troubleshooting was actual shooting. The trouble was the skunk lurking behind the furnace in the basement. Andy's solution was to blow the skunk away with his shotgun. The wife and kids moved into town with her folks for a month or so.
Not a real member - just an ordinary guy who appreciates being able to hang around and say something once in awhile.
Happily Trapped In the Past (Thanks, Joe)
Not only a less than minimally educated person, but stupid and out of touch as well.
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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OP
Campfire Ranger
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The furnace is 15 years old. I was trying to figure out the error code, but there was no key on the inside panel. I normally have two green lights that blink slowly simultaneously when all is good. Now they just blink alternately.
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Joined: Mar 2007
Posts: 9,209
Campfire Outfitter
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Campfire Outfitter
Joined: Mar 2007
Posts: 9,209 |
Can you ohm the coil on the gas valve? It should show resistance. If 24-27V are applied the coil should open the valve, which you should hear/feel.
Could be a bad valve or could be a bad spot on the board.
I would not buy something that runs on any kind of primer given the possibility of primer shortages and even regulations. In fact, why not buy a flintlock? Really. Rocks aren't going away anytime soon.
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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OP
Campfire Ranger
Joined: Mar 2005
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I'll try that. Thanks. I'm getting 27v to the valve, not sure what happens after.
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Joined: Feb 2017
Posts: 3,220
Campfire Tracker
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Campfire Tracker
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Stupid question. Is your gas shut off either at the furnace or meter?
Yours in Liberty,
BL
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Joined: Sep 2010
Posts: 2,306
Campfire Regular
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Campfire Regular
Joined: Sep 2010
Posts: 2,306 |
As has been said, replace the gas valve. They are pretty cheap and easy to replace.
Do not feed the bear!
White Bear sometimes treads on thin ice...
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Joined: Sep 2017
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Campfire Tracker
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Campfire Tracker
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What has stopped my furnace more than once is that the condensation line is blocked and the furnace won't turn on. It might not be the OP's issue, but certainly a common enough issue that we all should be aware of it and blow that line out. Another easy fix is replacing the AA battery in the thermostat.
My other auto is a .45
The bitterness of poor quality is remembered long after the sweetness of low price has faded from memory
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Campfire Kahuna
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Campfire Kahuna
Joined: May 2016
Posts: 60,115 |
Buddy just had to change the pressure switch on his fan.
That cured it.
I am MAGA.
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Campfire Outfitter
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Campfire Outfitter
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The Karma bus always has an empty seat when it comes around.- High Brass
There's battle lines being drawn
Nobody's right if everybody's wrong
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Campfire Ranger
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Campfire Ranger
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[spoiler][/spoiler]Mine was intermittent. Open limit code. Finally was constant. Pressure switch changed and no go. Ended up yanking the board and could see a hot spot.
Changed board $300 and its zoomin.
Amana, old one but should be good a while now
Last edited by hookeye; 11/27/21.
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Joined: Dec 2002
Posts: 15,850
Campfire Ranger
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Campfire Ranger
Joined: Dec 2002
Posts: 15,850 |
Tap the gas valve with a hammer while the coil is energized. If the valve opens moisture in the gas screwed up the valve, valve will need to be R&R.
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Joined: Feb 2017
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Campfire Outfitter
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Campfire Outfitter
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So according to your description: Watch guard – burner failed to ignite or lost flame 5 times during single heating demand I'd say the valve or low gas pressure, could have condensation in the line that froze.
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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OP
Campfire Ranger
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Posts: 17,527 |
So according to your description: Watch guard – burner failed to ignite or lost flame 5 times during single heating demand I'd say the valve or low gas pressure, could have condensation in the line that froze. yep. that makes sense. I don't believe there is condensation in the line, I have a drip leg before the furnace. Also, my garage is heated, so doubtful it could freeze. The hot water tank is right next to it, and working fine.
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