Smartvalve lights pilot not main burners

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Old 10-30-08, 01:15 PM
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Smartvalve lights pilot not main burners

Smartvalve lights pilot not main burners

I have a NG Arcoaire furnace, with ST9120C 4057 Fan Control and a SV9501M 2056 Smartvalve.

When I call for heat, inducer motor starts and the hot surface igniter lights the pilot. Blue flame is visible.
The sequence is stuck there, and eventually the pilot goes out and tries again in a couple of minutes.

Main burners just wont light. I jumpered pins 1 and 6 on the board's 6-pin Molex connector to bypass the limit switch, but no luck.
 
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Old 10-30-08, 01:23 PM
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Smartvalve is the problem. They are notorious for going bad.
 
  #3  
Old 10-30-08, 01:36 PM
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Originally Posted by mattison View Post
Smartvalve is the problem. They are notorious for going bad.
Do you have a suggestion?
 
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Old 10-31-08, 10:58 AM
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Exclamation

Any other testing or workarounds I might have missed before I blindly replace a $200 part?

I was of the understanding that smartvalves were the state-of-the-art, any thoughts?
 
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Old 10-31-08, 11:40 AM
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Check for 24VAC at the gas valve with a call for heat. If it's there then the valve is shot. Sometimes you can just play with the wires at the gas valve with a call for heat and it will start working. They are junk.
 
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Old 10-31-08, 01:52 PM
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Originally Posted by mattison View Post
Check for 24VAC at the gas valve with a call for heat. If it's there then the valve is shot. Sometimes you can just play with the wires at the gas valve with a call for heat and it will start working. They are junk.
With Pin 1 as common (on the 4-pin connector), I have 24vac at both pins 2 and 3, and an inconclusive (possibly floating) voltage at pin 4.

Any alternatives to buying another 'junk' smartvalve as a replacement?
 
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Old 10-31-08, 07:15 PM
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The smart valve was a great idea in theory. The flame sensor may need to be cleaned. I would try that before replacing the valve. A pilot/flame rod assembly is alot cheaper than a valve.
 
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Old 10-31-08, 08:03 PM
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Originally Posted by thermofridge View Post
The smart valve was a great idea in theory. The flame sensor may need to be cleaned. I would try that before replacing the valve. A pilot/flame rod assembly is alot cheaper than a valve.
Thanks, Ill give that a try when it's daylight.
Is scotchbrite too rough for cleaning?
 
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