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Re: Furnace troubleshooting... [Re: dogcatcher223] #16663117 11/27/21
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reivertom Offline
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I had the same problem last winter. The furnace would start up, the "purge fan" or whatever you call it came on, and then nothing. I had 3 techs look at it, and finally an older tech came and found the problem. The fresh air intake was plugged up right at the furnace by leaves it had sucked up from outside. There was a screen right where it enters the unit. They had installed it with an outside "breather tube" because my first plans for the remodel of the basement had the furnace enclosed in a closet, but I decided not to enclose it. I went ahead and busted out one of the air intake plugs on the side of the unit, and taped on a fine screen to keep dust out.

Last edited by reivertom; 11/27/21.
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Re: Furnace troubleshooting... [Re: dogcatcher223] #16663128 11/27/21
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rcamuglia Offline
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Check for a ”reset button”.

Had this happen….


Originally Posted by Bristoe
The people wringing their hands over Trump's rhetoric don't know what time it is in America.
Re: Furnace troubleshooting... [Re: dogcatcher223] #16666070 11/28/21
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elkmtb Offline
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If system detects a problem with the coil it won’t open the gas valve.

Re: Furnace troubleshooting... [Re: dogcatcher223] #16666160 11/28/21
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Replace gas valve. If your getting power to the valve all the safeties and switches are operating. I’ve replaced several Lennox G26 gas valves over the years.

Re: Furnace troubleshooting... [Re: dogcatcher223] #16666521 11/28/21
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robertham1 Online Content
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Make sure you actually have gas to the furnace. Any smell of gas? If you’re getting voltage to the gas valve- it may be stuck. Put your hand on the gas valve and see if you can feel it open up after the inducer/pressure switch proves/hot surface igniter go. I recently had a intermittent issue with a pressure switch that let me to replacing the gas valve before I realized it was the pressure switch intermittently opening/closing

Giving the gas valve a few thwacks with a screwdriver handle could unstick the valve, if that’s the case.

IC-A

Re: Furnace troubleshooting... [Re: dogcatcher223] #16666559 11/28/21
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blanket Offline
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Dang I miss pilot lights and thermostat couples

Re: Furnace troubleshooting... [Re: dogcatcher223] #16666631 11/28/21
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robertham1 Online Content
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If you smell gas- could be debris in the gas nozzle not allowing gas to get to the igniter

Re: Furnace troubleshooting... [Re: dogcatcher223] #16666651 11/28/21
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Look to see if the heat exchanger behind the burners are broken or cracked. You won't get heat if they are.



They are expensive to replace.


Don't ask me about my military service or heroic acts...most of it is untrue.
Re: Furnace troubleshooting... [Re: dogcatcher223] #16666655 11/28/21
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duckcall Offline
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Have you tried cleaning the flame sensor with a scotch-brite pad? That's all mine needed when it was acting like that.

Re: Furnace troubleshooting... [Re: dogcatcher223] #16666724 11/28/21
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Cheesy Offline
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Provide us the fix when it is fixed…

IC-B

Re: Furnace troubleshooting... [Re: dogcatcher223] #16666729 11/28/21
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Not the problem here, but I once had a mouse chew on the vacuum line that went to the “purge sensor” in a house where the furnace was in a crawl space once. Big hole in the line so the blower couldn’t “suck” closed the switch. I felt pretty smart figuring that one out.

Re: Furnace troubleshooting... [Re: dogcatcher223] #16667194 11/29/21
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hanco Online Content
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I’d say bad gas valve.

Re: Furnace troubleshooting... [Re: dogcatcher223] #16689139 12/05/21
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dogcatcher223 Offline OP
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Bought gas valve, didn't work... Still no flame. I hear it click, but nothing. I am getting 27 volts to the valve after the ignitor glows orange...


From a place you will not see, comes a sound you will not hear.
Re: Furnace troubleshooting... [Re: dogcatcher223] #16689143 12/05/21
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Jim_Conrad Offline
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Did you change the combustor fan and or switch?

Re: Furnace troubleshooting... [Re: dogcatcher223] #16689185 12/05/21
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CharlieFoxtrot Offline
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How many diagnostic light blinks?

I second taking an emory cloth or Scotch-Brite to the flame sensor. 5 minute fix.

Re: Furnace troubleshooting... [Re: dogcatcher223] #16689193 12/05/21
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dogcatcher223 Offline OP
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Flame sensor only sends message back that there is a flame. It is a safety switch... There is no flame.


From a place you will not see, comes a sound you will not hear.
Re: Furnace troubleshooting... [Re: dogcatcher223] #16689244 12/05/21
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12344mag Offline
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Two things.

1. What is the voltage on the gas valve label?
2. blow through the hose that gives the pressure reading to the pressure sensor to make sure it's not plugged up. blow in the hose from the pressure sensor towards the exhaust fan chamber.


Paul

"I'd rather see a sermon than hear a sermon".... D.A.D.

Trump Won!, Sandmann Won!, Rittenhouse Won!, Suck it Liberal Fuuktards.

molɔ̀ːn labé skýla

Re: Furnace troubleshooting... [Re: dogcatcher223] #16689260 12/05/21
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If your getting the hot surface to glow, and 27 volt’s to gas valve it sounds like you have a gas supply issue. Natural gas or propane?

Never mind re read first post. Is there a regulator at each appliance? I’d pull the cap off the drip leg and see if you have gas to the furnace.

Last edited by bubbajay; 12/05/21.
Re: Furnace troubleshooting... [Re: dogcatcher223] #16689764 12/05/21
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dogcatcher223 Offline OP
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I pulled the pipe off from the union and definitely have gas pressure. Then I blew through the pipe going into the valve and its open. Then blew through the pipe leaving the valve and its open too. Then I removed the valve and tried to blow through it, and its closed. Then I kept trying to blow through it even when I had voltage and it still is closed.

The replacement valve I bought was used, so i am suspecting they sold me a dud too...

My mind keeps telling me it has to be the valve. I am not smelling any gas etc when the ignitor glows. It seems the gas is deadheaded at the valve.


From a place you will not see, comes a sound you will not hear.
Re: Furnace troubleshooting... [Re: dogcatcher223] #16690211 12/05/21
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My igniter on my boiler would glow red but not hot enough I guess to light the flame.. it took me a week to figure it out.
I would replace the igniter it’s self.


Don’t sweat the petty stuff, don’t pet the sweaty stuff.
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