Gas Valve Chatter

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Old 12-18-05, 02:08 PM
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Gas Valve Chatter

I have a Bryant upflow furnace circa 1984. About 10 years
ago a new exact replacement gas valve was installed.

Ignitor and pilot comes on ok but when the main gas solenoid
kicks in it will (only occasionally ) chatter. By that I
mean instead of a nice clean single "click" when it opens,
it will chatter (a series of clicks) a few times then stay
open and everything then works fine. No other problems with
the furnace.

What would make it chatter thusly? What, if anything, should
be tested?

TIA,
Puddin'
 
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Old 12-18-05, 05:57 PM
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Have you taken a voltage readin on the gas valve to make sure you are getting a steady 24 volts on it? If yes, then the gas valve is bad.


If no, then trace back to see if a safty switch is acting funky.
 
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Old 12-23-05, 07:32 AM
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Originally Posted by Jay11J
Have you taken a voltage readin on the gas valve to make sure you are getting a steady 24 volts on it? If yes, then the gas valve is bad.


If no, then trace back to see if a safty switch is acting funky.
There is no problem with the voltage.

Know where an honest DIY'er can get a gas valve for reasonable
$? Furnace is Carrier upflow (58GS075-2), actually a
Bryant mnfgr circa 1984.

Thanks,
Puddin'
 
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Old 12-23-05, 12:47 PM
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If you are not in a rush, shop around on line. If you can't wait, then best to go to a dealer or wholesales dealer and get it.
 
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Old 12-23-05, 05:21 PM
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Normally, when you get chatter, like a contactor , relay or solenoid, the problem is from the device sending the voltage. In this case your control. That does not necessarily mean the control is bad. The biggest thing overlooked by techs when troubleshooting electrical parts is grounding and connections. Everything must be tight and a good ground is criticle.
 
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Old 12-25-05, 10:05 AM
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My similar problem

I have posted here recently about a similar double click or rattle from my WhiteRodgers gas valve. I was told to look afor a bad ground or connection, and also I called White Rodgers tech support and was told that sometimes the valves 'just do that' becaue of the plunger design in the solenoid. HOWEVER, I did some trouble shooting. I hooked up a relay and a couple of 24 volt bulbs from Radio Shack and saw that the voltage signal going to the gas valve was chattering. The bulbs would blink on/off/on etc. After studying the schematic, I found that the signal to the valve went through the "safety pilot" which itself closed the cirvuit to the gas valve after it got hot enough. To be positive, I soldered in a momentary contact switch in parallel with the safety pilot. When I pressed the switch, it made the gas valave make the nice solid click time after time. Diagnosis: safety pilot. so make sure you look at the controls BEFORE the gas valve!!!
 
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Old 12-26-05, 07:09 PM
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Thanks to thermofridge and mitchella for helpful responses.

Problem is, the chatter is intermittent and infrequent. It
might chatter on only 5% of cycles or less. Rest of the time
it's fine. Not sure it's practical to trace.

But I'm going to save all the dialog in this thread. May
come in handy this winter or next.

Intermittent elec. problems can be a Monumental Headache.
I had one on a motorcycle back in the 90's that took
nearly 3 years to properly diagnose.

Cheers,
Puddin'
 
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