Furnace main burner will not ignite


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Old 10-26-13, 07:40 AM
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Furnace main burner will not ignite

I have an older Carrier furnace type 58ss. The main burner will not ignite. Operating look ~ thermostat set @ 78 deg, switch furnace on, inducer fan running, pilot light clicks and ignites, inducer still running, after a short time (a minute or two) the blower kicks on and blows cold air. The main burner never ignites. Have checked all connections and replaced the main wiring harness due to a cracked connector. Installed a new circuit board and transformer. Cleaned pilot orifice. Need help.
 
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Old 10-26-13, 08:04 AM
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Do you get 24 VAC between white and blue at your gas valve after pilot ignition?

 
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Old 10-26-13, 01:37 PM
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Measure the AC voltage between terminals 1 and 2 on the electric gas valve. With the pilot lit as you describe, the voltage should be 24 VAC after a couple of minutes of the pilot being lit.

If so, then disconnect the wires to 1 and two. Measure the resistance (ohms) between 1 and 2. If the resistance is infinite, the main burner gas valve coil is burned out and the gas valve needs to be replaced.
 
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Old 10-26-13, 04:14 PM
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thanks for the tips

Turns out the inducer motor needs replaced. May be asking for tips when replacing it. Will be asking.
 
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Old 10-27-13, 07:46 AM
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Hmm I thought he said the inducer fan was running and pilot light kicks in, sounds more like a simple flame sensor proving issue??? Pull the flame sensor and give it a careful cleaning with some steel wool reinstall and you will be good to go. Note: purchase a spare flame sensor cuz this will happen again
 
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Old 10-31-13, 03:23 PM
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Thanks for all the input. Houston204, thanks, needed a good schematic. Have not progressed far enough to perform all the diagnostics. Took a couple days to get it but, OK, inducer fan replaced. New problem. Now there is no sparking (clicking) = no pilot. All connections good. No odor of gas. ?? Dis-assembling pilot/ignition assy. Tips on what to look for?
 
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Old 10-31-13, 04:34 PM
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Frankly Doughy, it's pointless to try to help you.


You apparently don't report accurately what is happening and you ignore the suggestions made that would help you identify problems in a logical way.

Why bother posting at all?
 
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Old 10-31-13, 04:40 PM
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Removed, cleaned pilot orifice again, cleaned ignition. Bright blue pilot.
Houston204 ~ Yes, I have 24VAC between white and blue at your gas valve after pilot ignition. ? Still no burner ignition.
 

Last edited by Doughoy; 10-31-13 at 04:56 PM.
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Old 10-31-13, 04:44 PM
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What is the voltage between terminals 1 and 2 on the electric gas valve while the thermostat is calling for heat and the pilot is lit?

If you have 24 VAC there, the main burner gas should switch on.

If it isn't, check the continuity as described in my earlier post.
 
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Old 10-31-13, 04:48 PM
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Unhappy

SeattlePioneer ~ Sry for the delays.
Disconnected the wires to 1 and two. Measured the resistance (ohms) between 1 and 2. Am getting 8.9 - 10.89 ohms. The voltage check is in the range of 26-27 VAC when connected and calling for heat.
 

Last edited by Doughoy; 10-31-13 at 05:25 PM.
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Old 10-31-13, 04:54 PM
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Red face

Correction ~ The voltage check is in the range of 26-27 VAC when connected and calling for heat.
 
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Old 10-31-13, 05:02 PM
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Reading some manuals there is mention to reset a manual draft safegard switch. Cannot find the location. Could this be a factor?
 
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Old 11-01-13, 03:53 AM
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Question

If the pilot is on, there is 24 VAC between one and two on the gas valve when calling for heat and good resistance reading when disconnected but there is no activation then it must be bad mechanics in the valve. ? Is there an option of opening and repairing the valve?
 
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Old 11-01-13, 03:35 PM
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Please describe the results of the tests. I can't tell what you found based on your comment, which is ambiguous.
 
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Old 11-06-13, 08:55 PM
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Thumbs up

thanks ~

Supplied voltage checked good. Coil, checked good - replaced valve, works like a champ
 
 

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