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Old 10-27-2012, 02:40 PM   #1
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gas furnace ignition problem.


Trane funace operates correctly through its steps untill the ignition of the furnace. The relay clicks but no ignition.

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Old 10-27-2012, 02:58 PM   #2
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gas furnace ignition problem.


So you ever see a hot surface ignitor glow?


If not, does it appear damaged?


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Old 10-27-2012, 04:21 PM   #3
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gas furnace ignition problem.


I can see the glow through the site glass.
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Old 10-27-2012, 07:50 PM   #4
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gas furnace ignition problem.


if ignitor glows and you here a click that is gas valve trying to open...if it don't open bad valve..ben sr
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Old 10-27-2012, 09:42 PM   #5
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gas furnace ignition problem.


Do you have other gas appliances working in the home?
Is the gas cock outside of the furnace and the small switch on the gas valve in the furnace turned on?
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Old 10-27-2012, 10:12 PM   #6
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gas furnace ignition problem.


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Originally Posted by ben's plumbing View Post
if ignitor glows and you here a click that is gas valve trying to open...if it don't open bad valve..ben sr
Maybe so but maybe not...
It's not really a complete picture unless one meters the gas valve feeds seperately from the gas valve. Some faulty boards will momentarily charge a gas valve just enough to cause the solinoid to engage before dropping out again. All you hear is a click from a momentary powering but the valve is perfect.

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Old 10-28-2012, 06:27 AM   #7
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gas furnace ignition problem.


Quote:
Originally Posted by how View Post
Maybe so but maybe not...
It's not really a complete picture unless one meters the gas valve feeds seperately from the gas valve. Some faulty boards will momentarily charge a gas valve just enough to cause the solinoid to engage before dropping out again. All you hear is a click from a momentary powering but the valve is perfect.
yes i agree how....but op says he hears a click...single...if powered by board for ignition you hear click ..if it drops call you should hear another click....or clicking sound.....lets wait to hear from op for more infromation....but good call..ben sr
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Old 10-29-2012, 10:06 AM   #8
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gas furnace ignition problem.


I have made sure gas valve is on and the only click I hear is from the black relay on the circuit board. I made sure all wires were getting connection to the gas Valve. Is it common for a gas valve to fail after 7 yrs.
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Old 10-29-2012, 10:19 AM   #9
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gas furnace ignition problem.


Gas valves, like boards, can fail anytime.
You will not know which might be faulty until you measure whether the gas valve is getting 24ac Volts or not.
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Old 10-29-2012, 11:59 AM   #10
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gas furnace ignition problem.


If I find that the valve is not getting the required voltage would that automatically point to replacing the board?
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Old 10-29-2012, 03:12 PM   #11
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gas furnace ignition problem.


If the valve is not getting the required voltage then the board is suspect. Some folks have had success at tapping that board relay you hear clicking with a screwdriver but that is usually only a temporary fix.
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Old 10-29-2012, 03:18 PM   #12
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gas furnace ignition problem.


If the Igniter is Silicon Nitride type. You can check the resistance ( 11-19ohms) if you measure high resistance, the igniter will glow the gas valve will open but the burners won't light.
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Old 10-29-2012, 05:19 PM   #13
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gas furnace ignition problem.


larry ..you have to confirm 24 volts at gas valve...as how said..ben sr

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