HVAC more about SPST, SPDT and SPNO-SPNC relays - YouTube - Sure, if the furnace continued to run with all the thermostat wires unhooked to the furnace then sure it is the one or both of the sequencers. If it become the blower relay that's the square box looking one then just the fan might run all the time without the strips being on, however for the reason that both are on that means it has to be a sequencer. The cord hooked underneath w2(aux on a few stats) the wire hooked below e, and the g terminal on the thermostat want to be taken off where they hook in to the furnace. If the furnace continues to run the electric strips and the fan with these 3 wires off then there may be an internal trouble with the furnace. If the furnace does no longer run then there's some thing crossed or wrong with the thermostat/wires.
I express regret i should have finished my due diligence and appeared the model numbers up. This is a reasonably new structures so all of the relays are internal to the manipulate board. I did now not study cautiously for your first submit in which it said latest machine. We deal more often than not with older structures giving problems. I talk greater approximately spst, spdt and spno-spnc relays. Interest: do not try any of what you see in this video at home. It takes at least two years of hvacr schooling to become certified to research within the field how to work on heating and air con equipment. Then it takes every other 3 years of apprenticeship training to end up competent enough to soundly work on heating and air con equipment. To donate cryptic currency: peercoin: pfcmau4dx2qm4ymwog3wfkkmkp7oxjhejd.
While there is a heat call the board sends the low voltage name to those sequencers which have high voltage attached on it's terminals which can be the m numbers. When he low voltage is despatched to these they close the bridge throughout them so the high voltage is then transfered to the alternative aspect of the sequencer which the electric strips hook to. If your problem is that each the heat strips and the fan keep to run then there's a manner to isolate weather it's far a warmth sequencer or fan relay or if it is the thermostat or the wires going to the thermostat.