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Furnace comes on Lo but no shift to High. Fan does not come on.

I have a Rheem Furnace RGPK series. Turn Heat on, set thermostat differential 10degrees or more) Stage one begins and the furnace ignites. However when stage two (hi burner) is called for the unit shuts down, ie, the burners go completely out. The thermostat begins flashing and 'call for service' comes on. The burners never get the chance to go 'hi' and the main fan never comes on (doesn't even try). There is no restrictions in 'return' air flow. I removed the lower panel and the fan area looks clean (system about 18mos old, 2nd winter). I have inspected the circuit board and found no appearance of damage, ie, burned wires/components, fuses, etc. Any help, advice is appreciated. Al

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There will be a separate pressure switch for hi fire, make sure all hoses are connected and free of moisture and debris. You can temporally jump the switch once the inducer fan speeds up, not before. If the unit fires on high, you have a pressure switch issue. If the fan does not speed up, you may have a bad relay on the control board. If the unit is just being put into winter service, it may have a cob web restricting gas flow to the burner. You will need to check the air inlet as well as the exhaust pipe for restriction. Check on the wiring diagram to make sure that the DIP switches are in the proper position, you never know. Hope this helps.

Posted on Dec 11, 2009

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