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Furnace Won't Light


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#1 BrewerGeorge

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Posted 16 April 2018 - 05:06 PM

These things aren't made to run into late April, apparently.

 

If I reset it, it will start up but then it doesn't seem like it's lighting.  After a few minutes it stops the big blower and a little one comes one, presumably to exhaust the unlit gas.  

 

It's 33F outside and 64F in the house.

 

FML



#2 D Fender

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Posted 16 April 2018 - 05:08 PM

Blinking light pattern on control unit?

Sounds like flame sensor or over-temp sensor, but the diagnostic code should tell you for sure.
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#3 Brian72

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Posted 16 April 2018 - 05:10 PM

Take the flame sensor out and clean it off with a piece of paper.
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#4 VolFan

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Posted 16 April 2018 - 05:11 PM

Can you see the pilot light?

 

It snowing here right now. I am hopeful this is the last cold snap as my body has clicked over to spring, especially after fishing this past Friday when it was 76.


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#5 BrewerGeorge

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Posted 16 April 2018 - 05:15 PM

Doesn't have a pilot; it's electric start.  At least I assume so since it sounds like a gas stove lighting.

 

I'm going to have to move a bunch of shit to get to the control panel. I don't think I have the emotional energy for it tonight.  Electric heaters it is.



#6 Dave McG

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Posted 16 April 2018 - 05:17 PM

Doesn't have a pilot; it's electric start. At least I assume so since it sounds like a gas stove lighting.

I'm going to have to move a bunch of shit to get to the control panel. I don't think I have the emotional energy for it tonight. Electric heaters it is.

cleaning the flame sensor takes about five minutes once you get the front panel open.
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#7 Brian72

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Posted 16 April 2018 - 05:17 PM

Is it lighting and cycling off after a couple minutes and then doing it again over and over?
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#8 D Fender

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Posted 16 April 2018 - 05:18 PM

Doesn't have a pilot; it's electric start. At least I assume so since it sounds like a gas stove lighting.

I'm going to have to move a bunch of shit to get to the control panel. I don't think I have the emotional energy for it tonight. Electric heaters it is.


There's probably a little view window in the housing so that you don't have to take a panel off to see the light. Just make sure the room is dark and you look straight in.
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#9 BrewerGeorge

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Posted 16 April 2018 - 05:18 PM

Is it lighting and cycling off after a couple minutes and then doing it again over and over?

Maybe.  Garage smells a bit like gas.  I'm assuming it isn't lighting.



#10 BrewerGeorge

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Posted 16 April 2018 - 06:18 PM

34 IGNITION PROVING FAILURE - Control will try three more times before lockout

#14 occurs. If flame signal lost during blower on-delay period, blower will come

on for the selected blower off-delay. Check for: - Control ground continuity

- Flame sensor must not be grounded

- Oxide buildup on flame sensor (clean with fine steel wool).

- Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal).

- Gas valve defective or gas valve turned off - Manual valve shut-off

- Defective Hot Surface Ignitor

- Low inlet gas pressure

- Inadequate flame carryover or rough ignition

- Green/Yellow wire MUST be connected to furnace sheet metal

 

 

Cleaned the flame sensor and cleaned the igniter.  No dice.

 

The igniter is not an arcing type, it appears to be a resistive element.  It appears to have a defect in it.  I'm going to check on ordering one.



#11 D Fender

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Posted 16 April 2018 - 06:23 PM

If the hsi doesn't glow red, then yeah, that's your issue.

The original description sounded like the main blower already came on, though. That wouldn't happen until after ignition.
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#12 BrewerGeorge

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Posted 16 April 2018 - 06:26 PM

Looks like this.

 

I don't know which blower is on, or if I'm hearing the gas itself.



#13 Brian72

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Posted 16 April 2018 - 06:29 PM

You'll hear the exhaust fan run for what seams like forever before the furnace tries to light and the actual furnace fan kicks on.
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#14 D Fender

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Posted 16 April 2018 - 06:33 PM

Looks like this.

I don't know which blower is on, or if I'm hearing the gas itself.

Yep. You should see it glow bright red inside the flame box. If not, and the shutdown happens after the gas turns on briefly and the draft inducer has been on for a bit, then just get a new hsi. Careful... they're very fragile.

Edited by Yukon, 16 April 2018 - 06:34 PM.

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#15 Dave McG

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Posted 16 April 2018 - 06:36 PM

Looks like this.

I don't know which blower is on, or if I'm hearing the gas itself.

Look real carefully at the existing one for a burn-through in the element. I suppose you could unhook it and ohm it out also. An open would mean it's toast. It's just a really big resistive heating element.
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#16 SchwanzBrewer

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Posted 16 April 2018 - 06:37 PM

What the the hell is a furnace?


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#17 D Fender

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Posted 16 April 2018 - 06:39 PM

What the the hell is a furnace?


It's that thing you need in the Midwest from September through May this fecking year.
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#18 BrewerGeorge

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Posted 16 April 2018 - 06:40 PM

Look real carefully at the existing one for a burn-through in the element. I suppose you could unhook it and ohm it out also. An open would mean it's toast. It's just a really big resistive heating element.

I took it off and scrubbed it down gently with steel wool.  I meant to test the resistance, but got distracted by something and forgot.  It definitely has a defect on the surface on both sides that look kind of like a burn-through.

 

I've ordered that one from Amazon.  Be here Wednesday.



#19 glassonion

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Posted 16 April 2018 - 06:40 PM

Looks like this.

 

I don't know which blower is on, or if I'm hearing the gas itself.

Take a fine piece of emory cloth and lightly buff the surface of the unit.


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#20 D Fender

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Posted 16 April 2018 - 06:44 PM

Take a fine piece of emory cloth and lightly buff the surface of the unit.

For the flame sensor. Not the hsi. If the hsi is toast, replacing it is the only fix. I always keep two spares on hand, as it's easy to break them.
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