Why is my heater blowing cold air? - Blu-ray Forum

Go Blue · 12-23-2008, 02:26 PM

Last night my AC/heater unit started blowing cold air when the heat was supposed to be on, which actually droped the temp in the house. I don't think the motor is running when the heat is on, so I think all the rain we have gotten recently has shorted the motor. I just had the motor replaced 6 months ago. Why would a new motor do this?

Psychonaut · 12-23-2008, 03:18 PM

Huh? If it's blowing the motor should be turning. The furnace lights a pilot then the blower kicks on. Sometimes the flame will go out but the blower will stay on, blowing cold air.

There is a flame sensor associated with the furnace. If you remove and clean it with some sandpaper, it may fix everything. It'll be a metal rod looking thing right near the front but pointing into where the flame would be.

jkwest · 12-23-2008, 03:24 PM

sounds like your pilot light may be out....

Teabaggins · 12-23-2008, 03:25 PM

does that mean his house is full of gas?

blujacket · 12-23-2008, 03:33 PM

Do you have gas heat? Or do you have a heat pump?

DrinkMore · 12-23-2008, 03:34 PM

Is it a Gas or Electric system? Sounds like a heat pump of course but more info is needed.

Go Blue · 12-23-2008, 03:35 PM

I think it is electric, not gas? I'm not home so I can't pull the grills off the unit to look. It is a Lennox, if that helps.

Go Blue · 12-23-2008, 03:39 PM

Quote:

Originally Posted by blujacket

Do you have gas heat? Or do you have a heat pump?

I am pretty sure it is a heat pump.

DrinkMore · 12-23-2008, 03:44 PM

Quote:

Originally Posted by schultz

I am pretty sure it is a heat pump.

Condenser sounds like its not kicking in or your heating strips inside (if equipped) are not coming on.

Go Blue · 12-23-2008, 03:47 PM

Quote:

Originally Posted by DrinkMore

Condenser sounds like its not kicking in or your heating strips inside (if equipped) are not coming on.

After doing some research, I think you are right about the heat strips. also, someone at work said it might be low on refrigerant.

blujacket · 12-23-2008, 04:20 PM

Could be a bad reversing valve coil. Is the heat pump iced up? Could be a defrost issue. Lots of possibilities.

quexos · 12-23-2008, 06:36 PM

Maybe you are treating your heater bad and it is taking revenge ?

SillyMammo · 12-23-2008, 09:24 PM

Quote:

Originally Posted by jkwest

sounds like your pilot light may be out....

that what it sound like to me. I have a very old furnace and it goes through igniting switches every couple of years.

Go Blue · 12-23-2008, 09:41 PM

Quote:

Originally Posted by blujacket

Could be a bad reversing valve coil. Is the heat pump iced up? Could be a defrost issue. Lots of possibilities.

Thats it. With the cold weather and rain, the coils iced up and tripped the breaker. Once the breaker was flipped, it fixed itself.

Next question, how to properly clean the coils?

DrinkMore · 12-23-2008, 10:30 PM

Quote:

Originally Posted by schultz

Thats it. With the cold weather and rain, the coils iced up and tripped the breaker. Once the breaker was flipped, it fixed itself.

Next question, how to properly clean the coils?

Soap and water. Nothing that will corrode the coils. Make sure you don't bend the fins either.

My_Two_Cents · 12-23-2008, 10:47 PM

Quote:

Originally Posted by schultz

Thats it. With the cold weather and rain, the coils iced up and tripped the breaker. Once the breaker was flipped, it fixed itself.

Next question, how to properly clean the coils?

Just hose the frozen coils down with water to remove all of the ice. If the freezing rain continues, just keep an eye on them and de-ice when needed again. I had this happen to a heat-pump we had years ago in our first Richmond home. I hate heat pumps. They suck when the temperature drops below ~25 degrees, or so.

Anthony P · 12-24-2008, 12:46 AM

is it constantly sending cold air or not? what can happen is that if it is cold enough the fan in the furnace can start circulating the air before the heat starts, so it is circulating the cold air (which feels cooler) like others have also said that sometimes the heat pump can need to go in reverse for a few minutes.

dk3dknight · 12-24-2008, 04:26 PM

Quote:

Originally Posted by schultz

Last night my AC/heater unit started blowing cold air when the heat was supposed to be on, which actually droped the temp in the house. I don't think the motor is running when the heat is on, so I think all the rain we have gotten recently has shorted the motor. I just had the motor replaced 6 months ago. Why would a new motor do this?

Ours at work would attempt to cool the room to the requested heat level that generally did not work.

Through in our case it was always the pilot light going out...

12-23-2008, 02:26 PM	#1
Go Blue Blu-ray Knight Top ranked HT gallery Member since:Jul 2007 Home Theater Gallery:23 Blu-ray collection:160 Trading Score:7	Why is my heater blowing cold air? Last night my AC/heater unit started blowing cold air when the heat was supposed to be on, which actually droped the temp in the house. I don't think the motor is running when the heat is on, so I think all the rain we have gotten recently has shorted the motor. I just had the motor replaced 6 months ago. Why would a new motor do this?

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12-23-2008, 03:18 PM	#2
Psychonaut Blu-ray Samurai Member since:Apr 2008 Location:Second left after Wal-Mart Blu-ray collection:111	Huh? If it's blowing the motor should be turning. The furnace lights a pilot then the blower kicks on. Sometimes the flame will go out but the blower will stay on, blowing cold air. There is a flame sensor associated with the furnace. If you remove and clean it with some sandpaper, it may fix everything. It'll be a metal rod looking thing right near the front but pointing into where the flame would be.

12-23-2008, 03:24 PM	#3
jkwest Off-Topic King Member since:Jul 2007 Location:Northern California PSN Id: jkwest5 Blu-ray reviews:1 Trading Score:20	sounds like your pilot light may be out....

12-23-2008, 03:25 PM	#4
Teabaggins Blu-ray Samurai Member since:Aug 2008	does that mean his house is full of gas?

12-23-2008, 03:33 PM	#5
blujacket Blu-ray Guru Member since:Jun 2007 Location:Dayton,Ohio 4K collection:70 Blu-ray collection:658	Do you have gas heat? Or do you have a heat pump?

12-23-2008, 03:34 PM	#6
DrinkMore Banned Member since:Apr 2007 Location:That's What She Said! Blu-ray collection:140 Blu-ray reviews:7 Trading Score:3	Is it a Gas or Electric system? Sounds like a heat pump of course but more info is needed.

12-23-2008, 03:35 PM	#7
Go Blue Blu-ray Knight Top ranked HT gallery Member since:Jul 2007 Home Theater Gallery:23 Blu-ray collection:160 Trading Score:7	I think it is electric, not gas? I'm not home so I can't pull the grills off the unit to look. It is a Lennox, if that helps.

12-23-2008, 04:20 PM	#11
blujacket Blu-ray Guru Member since:Jun 2007 Location:Dayton,Ohio 4K collection:70 Blu-ray collection:658	Could be a bad reversing valve coil. Is the heat pump iced up? Could be a defrost issue. Lots of possibilities.

12-23-2008, 06:36 PM	#12
quexos Banned Member since:May 2007 Location:Brussels, Belgium	Maybe you are treating your heater bad and it is taking revenge ?

12-24-2008, 12:46 AM	#17
Anthony P Blu-ray Count Member since:Jul 2007 Location:Montreal, Canada	is it constantly sending cold air or not? what can happen is that if it is cold enough the fan in the furnace can start circulating the air before the heat starts, so it is circulating the cold air (which feels cooler) like others have also said that sometimes the heat pump can need to go in reverse for a few minutes.

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