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When heat comes on, furnace runs for about 8 mins then cycles off. When the heat clicks off I get a switch open code from the board. While the furnace is running I get a normal operation code. As soon as it clicks off the gas, the switch open code re-appears. 8 mins on and 2-4 off no matter where I have the therm. set. Thanks for your help, Paul

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    What model # is your furnace? Have you changed the filter recently? – Robert Nubel Oct 25 '17 at 21:25
  • Does the furnace have a forced air fan or is it a gravity furnace? – d.george Oct 26 '17 at 9:38

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