Originally posted by frozenrice
jeffh, I was wrong when I said the blower fan was working too. The inducer fan makes enough noise that it sounded as if the main blower was on too. Anyways, after a bit of a gong show yesterday (wrong replacement board was supplied), it seems to be finally working. Woke up to a warm house this morning and just to make sure, I dialed up the thermostat just to get the furnace to fire. It came on like it should so hopefully that was the fix.
As far as I know the codes for Lennox don't have specific number of flashes to diagnose problems. It's either a combination of on/off/quick/slow blinking. As mentioned in my other posts it was one off and the other slow blinking.
Glad you got it working. I am surprised it's the board, unless it has leaking caps or loose connections, I would think they are pretty reliable. I was thinking perhaps it was your igniter. Also, you replaced the pressure switch, but I heard that people say that the actual connection on the inducer fan may be plugged. Have you tried to clean that opening with something? I cleaned mine with just a paper clip, but had no residue of any kind for me. If the pressure switch is not closing, the ignitor would not light up at all. It does sounds like a pressure switch problem, so even if you replaced it, the actual port on the inducer fan may be blocked.
If the issue pops up again, have a look at that connection, and also blow out the tube that makes the connection. Mine was clean but some youtube videos showed definite build up.
Report this post | IP: Logged