Can anybody tell me how only this furnace is? I moved into 2 years ago, but not sure. Is it time for a new furnace or new circuit board?
When call for heat, electronic ignition gets red and fails. Once fails, the furnace tries again but fails continuously. The inducer is working and pressure switch is working as well.
However if I turn off and wait 10 minutes or so, most of times it works again for only half day. And then fails it again. I found 3 flashes on LED which indicates pressure switch. But it doesn't look that way. Rather it works if I touch the circuit board, but it is not always that way either.
Well, it's either the pressure switch, but more likely the tubing going to the pressure switch is clogged.
You see, most furnace makers build a vent blower out of metal that reacts to the moist flue gases, then the metal/rust particules fly around inside the vent blower, with some exiting out and a few stop up the hole where the pressure switch tubing connects, so, take it loose and see if ther is something either clogging the tubing or the hole in the vent blower.