Hello I have a Lennox air handler and furnace in my home, and it's behaving oddly.
It generally works properly, but every once in a while (say, twice a day) it either doesn't respond to a call from the thermostat, or it turns off before reaching the desired temperature. This is true regardless of whether it's being called to heat or cool.
The odd solution to making it respond is to touch the chassis the control board is on, or to even touch one of the components. For example, I can touch a relay (Potter & Brumfield t9as1d12-24) lightly on its side with a wood stick, and this will turn the unit back on. It also works if I use my finger, but I tried the wood stick to see whether it was a grounding issue.
This has baffled the repair guy who was out here. He suggested that we just replace the board. If there's a component problem, I suspect that will work, but is it possible to just remove and replace a bad relay, for example? If not, I have no problem replacing the board. But the fact that I can flex the whole chassis without even touching the board directly makes me wonder whether replacing the board will even fix the problem.
Has anyone seen this issue or have any ideas I can pass along to my tech?
I will post photos and videos of this if I can, but as this is my first post, I'll have to go post a little bit before the forum will let me.
Thanks a million!
It generally works properly, but every once in a while (say, twice a day) it either doesn't respond to a call from the thermostat, or it turns off before reaching the desired temperature. This is true regardless of whether it's being called to heat or cool.
The odd solution to making it respond is to touch the chassis the control board is on, or to even touch one of the components. For example, I can touch a relay (Potter & Brumfield t9as1d12-24) lightly on its side with a wood stick, and this will turn the unit back on. It also works if I use my finger, but I tried the wood stick to see whether it was a grounding issue.
This has baffled the repair guy who was out here. He suggested that we just replace the board. If there's a component problem, I suspect that will work, but is it possible to just remove and replace a bad relay, for example? If not, I have no problem replacing the board. But the fact that I can flex the whole chassis without even touching the board directly makes me wonder whether replacing the board will even fix the problem.
Has anyone seen this issue or have any ideas I can pass along to my tech?
I will post photos and videos of this if I can, but as this is my first post, I'll have to go post a little bit before the forum will let me.
Thanks a million!
But a bad solder joint does sound like a good suspect.
