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Furnace staying stuck in pre-ignition
I have an HB Smith gas furnace. Recently the furnace becomes hung up in pre-ignition and just the hot surface ignition glows bright orange but does not ignite the furnace so it just continues to run until I turn off the furnace switch and turn it back on. The furnace will then run fine but then gets hung up again the next time there is call for heat or to run the hot water tank. This used to only happen once in awhile but now is happening more frequently on a daily basis. Any suggestions?