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Old 12-17-2011, 07:13 PM   #1
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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

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Old 12-17-2011, 07:27 PM   #2
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Day and night furnace


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

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Old 12-17-2011, 07:35 PM   #3
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Day and night furnace


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.

Last edited by how; 12-17-2011 at 07:41 PM.
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Old 12-18-2011, 10:14 AM   #4
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Day and night furnace


Quote:
Originally Posted by Sweet willy View Post
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
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Old 12-18-2011, 11:43 AM   #5
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Day and night furnace


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.
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Old 12-18-2011, 01:17 PM   #6
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Day and night furnace


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Originally Posted by Sweet willy View Post
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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