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Electronic ignitor comes on but burners only come on every once in a while.

Electronic ignitor comes on but burners only come on every once in a while.

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  #1  
Old 01-17-17, 06:56 PM
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Electronic ignitor comes on but burners only come on every once in a while.

This is a Ruud two stage natural gas furnace. I can feel the
Gas valve try and open but it doesn't. Any help would be appreciated.
 
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  #2  
Old 01-17-17, 06:59 PM
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What's gas pressure? Both manifold and inlet? What is inlet voltage on the valve?
 
  #3  
Old 01-17-17, 10:18 PM
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I had about 6.5 on the input. I couldn't get it to fire to get an output reading. I will get back with you for a voltage reading. I feel the valve actuating when the ignitor fires. Then the unit starts the cycle over again and tries to get flame again. There is 6 quick flashes and then it goes into normal and tries to fire again.
I hope I explain myself good enough.
 
  #4  
Old 01-17-17, 11:16 PM
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It would be a lot easier for us to help you if we had the model number for your furnace.
Since you have a two stage gas valve things will be slightly more complicated.

The gas valve runs on 24vac.

The draft inducer comes on first.
Once the pressure switch proves..... the igniter starts heating.
The igniter needs to heat for 20-30 seconds.
After that heating period the gas valve opens.
The gas valves is only powered/opened for 5 seconds if the flame doesn't prove.
When the igniter goes out.... the valve has closed.
 
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Old 01-19-17, 09:09 PM
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I got got about 16 v when it fired and now its running and I have a 1.7 for my low fire gas valve output.
 
  #6  
Old 01-19-17, 09:15 PM
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So you have 16vac on the high fire section of the gas valve ?
That's too low. It may work but it should be higher.

Try checking it right at the board during operation and see if it's the same at that end.
A low voltage could indicate a bad relay in the control board.
 
  #7  
Old 01-19-17, 09:22 PM
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I replaced the control board because I couldn't get it to fully cylce and now its cycling everytime for me, just not firing up all the time.

It fires on the low side. Do you think it has to do with the 2 stage.
 
  #8  
Old 01-21-17, 03:52 PM
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The ground wire that came with the new control board wasn't installed. This is why it wouldn't fire and was getting 6 flashes.
 
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