Gas and Oil Home Heating Furnaces - Air Conditioner Blowing Only Hot Air

I have a Goodman CK36-1B air conditioner. 2 days ago, someone switched the fan from auto to on. By late that afternoon, it had heated up considerably in the house. We discovered this and rest the switch to auto. However, by that time, it was 95 in the house. The outside unit quit working; however, the fan continues to blow. We have cleaned the outside unit, taking the cover off and cleaning the inside of the unit.

When we moved back into our house 2 years ago, we were unable to get the unit to work and had a friend come over who found a reset switch in the attic. That brought the unit back on and it has worked ever since. The friend has moved and we don't know where the reset switch is or if it will even work.

Does anyone have any ideas? We are unable to replace the unit at this time and really can't afford to call a serviceman.

Thank you.

I'm going to take a stab and assume you have gas heat?? What has probably happened is the limit switch in the furnace is tripped or is defective. Modern furnaces have the limit switch wiring configured so that if the limit switch opens, the indoor fan runs full time in an attempt to cool down the furnace and, at the same time, the power to the controls is interrupted which shuts everything else down. Go up in the attic and take the covers off the furnace. Look in the blower section first and see if there isn't a small round disk affair with a reset button on it; it's probably mounted right on the blower housing. If it's not there, then look in the furnace section.

One of the young men who live here and works with an electrician is on his way up there now to see if he can find the switch. I will let you know. And, thank you so much.

Two 17 year olds have been in the attic and cannot find which panel to take off. They took off one and turned the furnace on. Do you have any idea where they should look? The installation of this unit was less than spectacular. They even cut some of the ceiling joists when they installed this.

Any ideas on where to look would be appreciated.

Two 17 year olds have tried to find the switch. They took off one panel and wound up turning on the furnace. Do you have any idea where they should try looking? The unit is quite large.

Thank you.

Check the thermostat and make sure that someone didn't accidently turn it to heat?? There should be a panel cover over the furnace area and a panel cover over the blower area. They usually slide/pop right off from the front of the unit. The panel cover the furnace area that they took off is right next to the one for the blower section on the same side of the unit.

if i understand correctly, the o/d unit does not run? if this is the case, is there any water in the pan in the attic?

The reset switch isn't in the blower section, nor is it in the furnace section. I remember our friend said it was in a really odd place.

We are all staying in the den tonight because there is a window unit in here that works well. We are going to take the whole thing apart tomorrow and find that switch!

Thank you for your help. Any other ideas?

There is no water in the pan. Does that mean something?

By no water in the pan, I assume you mean the drain pan underneath the furnace in the attic.?? If so, there shouldn't be any water in the pan. It's an overflow pan intended to catch water overflowing from the unit in the event that the main drain on the cooling coil gets plugged up. [actually, I should say WHEN it gets plugged up] While you're up in the attic, see if you can flush out the drain line from the unit and also run some water thru the secondary drain line in case some critters set up housekeeping in there. Read some of posts from the past couple days for tips on how to flush out the drain line. Let us know how you make out. Look along the duct work near the unit for the limit switch although it should be in the unit.