[alborgi]

My furnace blower fan will not start in auto, and eventually the flame is shut off by a high limit on the squirrel cage. The safety is working so that's good.

Now I know that it should start, as I can see the fan control temp dial turning on the L4064B2954 Honeywell combination fan blower limit switch, and it definitely getting well past that setpoint. When I see that, I simply start the fan in manual, and then pull it out into auto, and it stays running. It shuts down fine.

I had to change out a bad blower motor a few days ago, and this is when the auto began to fail. Is it possible the bad motor damaged this combination fan limit switch, and is there a way for me to repair the switch some how?

I can buy one, but they are hard to find. 3-4 days to deliver from Thunder Bay.

Just looking for any kind of advice that's out there. My experience tells me it's pooched, but I just want a quick fix before Christmas.

Thanks, Albert

[mygirlsdad77]

No repairing the honeywell fan/limit control. Just going to have to keep doing what you are doing to get by and wait for the new one. Have you checked with any local plumbing/hvac shops. Odds are they will have one in stock.

[alborgi]

Thanks for your response; yes I have checked locally, apparently that one is back ordered due to a manufacturers short fall. I may check kijiji though.

[alborgi]

Morning:

Got a replacement fan limit seitch a few days ago, locally I might add, and all is good. I took the old one out and inspected; it just seems to stick while turning. Not much to it electrically, contacts are fine. The only thing I can surmise is that the spring in the start mechanism had got weak. I tested it in a hot wood fire, not directly on the flame, and the switch easily came on in about 15 seconds. Then it stuck shutting down. Lol. This switch is mostly mechanical, and I was able to clean it, and get it to work well enough to be a spare

Thanks, Albert

[mygirlsdad77]

Thanks for the update. I truly appreciate that.