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Sweet willy 12-17-2011 08:13 PM

Day and night furnace
 
I replaced the motor, limit switch, transformer and the motor cap. the furnace works but it wont shut the blower off so it just keeps blowing cold air. any ideas what to do next

ben's plumbing 12-17-2011 08:27 PM

need more than that...make, model how old is unit..some pictures would help..

how 12-17-2011 08:35 PM

Lots of possibilities.
Any idea how old your furnace is?

Is it an older Night & day with a summer fan switch that's on?

Does your thermostat have a fan switch that's "on"?

Any recent construction that could have put a nail through the wall and through the thermostat lines?

With the power off to your furnace, you could try gently tapping the blower relay on the board with the handle of a screwdriver to see if it will unstick.

Tator1076 12-18-2011 11:14 AM

Quote:

Originally Posted by Sweet willy (Post 796288)
I replaced the motor, limit switch, transformer and the motor cap. the furnace works but it wont shut the blower off so it just keeps blowing cold air. any ideas what to do next

Way did you replace all that for. I can see motor and cap. Maybe limit switch but why transformer. This is adding up to :surrender:

how 12-18-2011 12:43 PM

It's like saying I have a faulty garden hose that won't turn off. Anything that has the capacity to keep the motor running occurs before the motor/cap.
But hey, I'm the guy who once took a poor friends electric stove apart because it wasn't working, only to find (an hours schematic read later) that he had the timer on.

harleyrider 12-18-2011 02:17 PM

Quote:

Originally Posted by Sweet willy (Post 796288)
I replaced the motor, limit switch, transformer and the motor cap. the furnace works but it wont shut the blower off so it just keeps blowing cold air. any ideas what to do next

There is more then one limit.....i am guessing that a "roll-out" is tripped, this is a potential deadly condition, and I would strongly advise you to call a pro at this point.


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