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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22541
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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My furnace isn't working. Just blowing cold air

Customer Question

My furnace isn't working. Just blowing cold air
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.


do you have the make and model number?

Customer: replied 1 year ago.
Lennox slp98uh
I am getting error codes
Expert:  BillyHvac replied 1 year ago.

Ok this could be several itrms.

First is to make sure the ventpipes to outside are clear, no nest, leaves or water got in piping...can you check these?

Expert:  BillyHvac replied 1 year ago.

basically we have a air switch not closing like it should.

It can be blockage in pipes

Blockage in drain system

Bad inducer motor

Customer: replied 1 year ago.
The furnace is 2 months old. I hope it's not the motor. It got a 49 degree difference last night. 39 to -20. I checked the pipes and can't really see anything. There is some frozen water at the exhaust point and the drain. But it's a little amount
Expert:  BillyHvac replied 1 year ago.

It is most likely water trapped, a leaf sucked in....

I would recommend not taking anything apart due to warranty. If only 2 months old you should have free service on it still.

You can use a shop vacuum on vent pipes and drain, but that is as far as I would go with it under warranty