Gas valve getting 23VAC & main burner doesn't come on


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Old 02-23-13, 08:03 PM
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Gas valve getting 23VAC & main burner doesn't come on

5-year-old Payne gas-fired furnace failed to fire. Below is the sequence:-
a) Inducer fan kicks on
b) HSI on for 15 seconds
c) Voltage to gas valve changed from 14v to 23v during above 15 sec.
d) Gas valve failed to open

Checked and bypassed all the limit switches; same problem.
Applied 27VAC from another transformer directly to the gas valve & the valve opens (gas line shut off)
Thought it was a bad circuit board, replaced with a used circuit board - still no heat.
Question - why only 23v from the circuit board when the transformer output is 27v? Wiring or circuit board issues?
Thank you!
 
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Old 02-24-13, 02:30 AM
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The voltage should go from 0 to +/- 24 vac.
23 vac should open the valve but what concerns me is you say it goes from 14 volts to 23 volts. That doesn't sound right.
 
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Old 02-24-13, 01:09 PM
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Both circuit boards (original and replacement board) provide 14VAC to the gas valve before HSI comes on; then it fluctuates between 22V and 23V when the HSI is lighted. Is it possible that both circuit board are bad or should I replace the gas valve?
 
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Old 02-24-13, 01:29 PM
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Is there a part number on the control board.

It doesn't sound like a gas valve issue.
 
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Old 02-24-13, 02:00 PM
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Trace the voltage level from the transformer to the circuit board. It should be either 0 or 24 VAC (more or less) all the time.

You may have a bad switch (such as a limit switch) which is defective and not connecting the voltage properly, or you may have a circuit board which isn't making a good electrical connection.

You want to track down where that bad voltage starts as best you can.
 
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Old 02-24-13, 08:40 PM
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Circuit board # is 0411HK42FZ013 made for Carrier/Payne. I have jumped all limit switches and still get 14VAC and then 23VAC at the gas valve. All connections seem fine. Thanks
 
 

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