Sequencer only works with the heat. If it stays on with AC then it is the fan relay/blower motor relay.
furnace blower fan
If I run my furnace in heat cycle or ac cycle, the fan may run fine to shut off after cycle but sometimes stays on. If I tap the side of the furnace it shuts off. Could this just be the blower motor relay or is it the sequencer. this is a bryant electric furnace.
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Not the best advice. There should be more than 1 sequencer and if you disturb them and yank wires off they sometimes start to stick and you then created a problem. Sequencers don't work with AC.
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