Stumped! Heil furnace.

Ashpadgett55 · 10-19-2012, 05:36 PM

I've got a 15 yr old heil furnace with issues. The fan kicks on, the glow igniter turns on, the pilot lights, but the main burner will not kick on. The gas valve is a year old and the igniter kit is 5 minutes old. I replaced it because it made since that that might be the problem.(but its not) any help would be appreciated.

ben's plumbing · 10-19-2012, 05:57 PM

Quote:

Originally Posted by Ashpadgett55

I've got a 15 yr old heil furnace with issues. The fan kicks on, the glow igniter turns on, the pilot lights, but the main burner will not kick on. The gas valve is a year old and the igniter kit is 5 minutes old. I replaced it because it made since that that might be the problem.(but its not) any help would be appreciated.

check to see if you have 24 volts at gas valve..if you do bad valve,,,if you don't check for open limit, open roll out switches,,or other saftey switches....may be some saftey switches on blower housing.....

Ashpadgett55 · 10-19-2012, 06:18 PM

Quote:

Originally Posted by ben's plumbing

check to see if you have 24 volts at gas valve..if you do bad valve,,,if you don't check for open limit, open roll out switches,,or other saftey switches....may be some saftey switches on blower housing.....

Are you talking about where the wire harness gets plugged into the gas valve coming from the igniter?

Ashpadgett55 · 10-19-2012, 06:23 PM

I just checked a switch where the rubber hose hooks up and I am getting infinite ohms. Should I be or is that a bad safety switch?

techpappy · 10-19-2012, 06:56 PM

if pilot lights as you have indicated then iot could be that the flame sensor is not positioned properly to sense the pilot flame ..it should be positioned to have tip in flame and be close to ground/metal area of the sensor bracket..also could be touching metal somewhere thereby shorting the sensor out to ground OR cracked insulator allowing short

OR bad board?

Ashpadgett55 · 10-19-2012, 07:09 PM

Quote:

Originally Posted by techpappy

if pilot lights as you have indicated then iot could be that the flame sensor is not positioned properly to sense the pilot flame ..it should be positioned to have tip in flame and be close to ground/metal area of the sensor bracket..also could be touching metal somewhere thereby shorting the sensor out to ground OR cracked insulator allowing short

OR bad board?

I am starting to think bad board. Would it go through every step except the last step with a bad board?

techpappy · 10-19-2012, 08:41 PM

did you check for 24 volts at gas valve?..if there is then as stated ..gas valve faulty

how · 10-19-2012, 09:43 PM

A harness from the igniter to the gas valve sounds like a Smart Valve with all its attendent pin connection problems.

ben's plumbing · 10-20-2012, 07:33 AM

yes they had problems with there pin to gas valve connection ..smartvalve...try to jiggle connector when pilot is lit and calling for burnner to fire....but you said valve is only 1 yr old so i doubt if you have the old style valve...ben sr

Ashpadgett55 · 10-21-2012, 01:53 PM

Quote:

Originally Posted by ben's plumbing

yes they had problems with there pin to gas valve connection ..smartvalve...try to jiggle connector when pilot is lit and calling for burnner to fire....but you said valve is only 1 yr old so i doubt if you have the old style valve...ben sr

It is the new style valve. I replaced the old one last year. Could it be the board? Considering how far through the process it's going.

how · 10-21-2012, 03:02 PM

Yes it could be the valve or the board! It's just that possible valve system gives us all so many problems.
If you give us the make & number of your gas valve or better yet
post a picture of it, the answers will be more helpful.

Ashpadgett55 · 10-21-2012, 10:12 PM

Hopefully this works. Here's a pic

Ashpadgett55 · 10-22-2012, 11:02 PM

I feel like I have tested everything. But not sure I am testing the gas valve correctly.

HVACTECH96 · 10-23-2012, 07:16 PM

ignition control is part of gas valve.Double check ignitor/sensor is mounted in pilot assy properly.I had one that was not setting properly due to c clip not installed right, and flame sensor was touching pilot hood.Pilot would lite but no main valve.Repositioned correctly and furnace took off.

ben's plumbing · 10-23-2012, 08:03 PM

could you take off ignitor an get us a picture of it ....the wire from gas valve to ignitor looks odd... i had a tempstar i put a universial ignitor kit it went to pilot like your's ...put on oem ignitor did the trick...ben sr