Sticking Robertshaw gas valve

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  #1  
Old 03-06-08, 11:28 AM
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Sticking Robertshaw gas valve

I have an old Sears wall furnace with a replacement RobertShaw 7000 series gas valve (not one of the ones that were recalled). In the morning lately the furnace won't ignite. The pilot light is on, I replaced the thermocouple last year, and if I bang on the gas valve the furnace will ignite. Usually in one hard knock, sometimes it takes a couple. So apparently something (the diaphragm?) is sticking. Is there anything I can do to fix this other than replace the valve?
 
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Old 03-06-08, 12:41 PM
pflor's Avatar
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the valve should be replaced
 
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Old 03-06-08, 03:14 PM
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There is no way to repair the gas valve so as pflor said it will need to be replaced.

However, before doing that I would check the voltage at the gas control valve to assure you have sufficient voltage to open it. Depending on if it's a 24 volt system or a millivolt system will be dependent on the proper voltage at the gas control to open it. If it's a 24 volt system, you should have approximately 25 volts at the gas control for a call to heat. If you have a millivolt system, with a thermopile, you should have a minimum of 500 mv (millivolts) but 750 mv is ideal.
 
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Old 03-08-08, 09:53 AM
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Not to hijack any body's reply, but also check the connections on the gas valve too. You can remove them (if they are spade connections) and put them on and off a few times to clean the contact surfaces. They should be nice and snug. If there are any wire nut connections on any of the gas valve feeds I would double check those connections too.
 
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