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Turn Thermostat to call for heat (here click)from the t-stat calling. I do not here the multiple click (ignitor)and then the flow of gas. I have a Honeywell VR8204M electronic gas valve. I have votage coming from the control board "PV" to my electronic valve. My question is do I have to change the entire electronic valve or should check some other things first.

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That particular intermittent pilot gas valve uses one of three ignition control modules; S86F, S8600F, and S8610. Check the pilot assembly and look at the flame, could be a weak flame, dirty or clogged, if its not lit or weak, you’ll hear a constant buzzing or “sparking” sound, this will lock-out the gas valve. If you hear nothing at all, start with cleaning or replacing the pilot assembly, then check the ignition control module.

Hope this helps

Posted on Dec 03, 2008

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Wiggle wires, it could be something as simple as a loos connection. If your getting power to valve and it's not opening your valve is bad. Also check your limits somethimes all limits are connected and one broken one will throw the system off.

Posted on Dec 02, 2008

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1 Answer

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If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

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2 Answers

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Pressure switch detects proper operation of DIM, and sends signal to board to begin ignition.
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Ignitor starts ignition attempt and gas valve sends gas to burners.

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