I have a lennox whiper furnace model c23-31-1 and when the furnace lights after a minute or so you can hear a click sound but the blower motor doesn't kick on. If I put the thermostat fan control to 'on' the fan will run constantly and the furnace will work but when the thermostat is set to 'auto' it does what I described at first. What is wrong with this?

Mike

The fan and limit control OR the fan relay is defective when operating in the heat mode. Usually the heat exchanger heats up to a preset level then the blower turns on.

Check this gadget, if present.

It doesn't have that gadget.

Sounds like the blower is managed by a circuit board, which may be malfunctioning.

I have a Lennox Pulse furnace G14. Does anyone in this DIY world know where I can find parts for this unit anymore, specifically this fan/limit control? Any help would be great.

If you are smart you will replace the Lennox Pulse. It is old but the main problem is it is a big troublemaker. If you decide to fix it you better find a old furnace man who has a boat load of experience with the Pulse furnace. If not adjusted properly they can go BOOM.

Thanks HVAC

Quote:

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Originally Posted by Benny01

Thanks HVAC

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Got any suggestion on a brand for a new one. 1600 sq ft house. Built about 1955

Most a newer furnaces are good where there problem comes to play is in the install. You can take a cheap furnace and make it purr like a kitten with the proper install but you can take the most expensive unit and turn it to junk with a bad install. Been saying this for over 45 years and it has always held true.