Question about Heating & Cooling

1 Answer

I have a horizontal magic chef gas heat/cool furnace (circa 1980) located in the attic. In the summer with the thermostat off and the fan switch on off, the fan on the unit will turn on all by itself when the attic temperature reaches around 100 degrees thus blowing warm air into the building. I have changed the thermost with same result. This fan is getting power from someplace. Nothing is on the wiring diagram showing a temperature switch on the unit. Where should I look to find what is causing the fan to come on?

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Guru:

    An expert who has written 7 tips or uploaded 3 video tips

  • Contributor
  • 683 Answers

It has a thermister on it, but would recommend an attic fan will keep attic cooler and save money on cooling bills.

Posted on Mar 25, 2011

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

We have royal red furnace to heat our home.The fan dose not stop.


Details.......does the furnace function normally otherwise? Might just be a stuck fan switch. Make sure the thermostat hasn't been set on Fan ON setting or summer air circ. on older furnaces.
Find the fan switch and tap it and see if fan quits. If it does,fan switch is bad.probably. Always make sure your air circ. filter(return air to furnace) is replaced every 3 mo. or so,too. don-ohio (:^)

Jan 03, 2017 | Royal Heating & Cooling

1 Answer

My blower on my carrier furnace unit won't turn off? a/c or heater doen't turn on.


gas furnace??? check the start capacitor, put unit in ac mode and see if fan comes on(switch fan to on at thermostat) if it does not a fan problem or capacitor problem. when in cooling mode thermostat controls fan, when in heating mode, furnace controls fan

Feb 18, 2015 | Carrier Heating & Cooling

1 Answer

Where is the summer/winter switch located on Dayton Fuel Trimmer furnace model 3E438A.?


The typical 'summer/winter' switch is an added switch associated with OLD heating systems back in the 50's and 60's before central air conditioning became common in homes. I doubt that your new furnace had one installed because you can accomplish the same thing by switching the fan on at the thermostat sub-base. That is, of course, providing you have a subbase with 'fan-on-auto' on it.

Jan 07, 2015 | Dayton Heating & Cooling

1 Answer

Will not switch off


make sure the one that says "cool, hot, and off" is switched to off.

Mar 02, 2014 | WHITE-RODGERS DIV 1F56N-444 Universal...

1 Answer

My honeywell thermostat will not let the fan blow if it's on automatic


Depends on what type of heat you have...if it is electric, it could be your thermostat (some electric heaters use contactors & rely on the thermostat to switch the fan on). Heat pumps also use the thermostat to switch the fan on in heat & cool mode. Most electric furnaces use a sequencer to switch the low speed of the fan whenever there is a call for heat. Gas furnaces use either a fan/limit controller (if the unit is older) OR a circuit board based on time (after the thermostat calls for heat). SO depending on the type of system you have, it could be a bad sequencer, controller, relay, thermostat, or control board.

Dec 17, 2013 | Heating & Cooling

1 Answer

Bryant programmable thermostat doesnt keep the temp have to put it on fan instead of auto


My guess is that you have gas heat. If this is the case, sounds to me like your main control board or depending on age of furnace, fan controller is not working. With gas furnaces, it utilizes 2 fan speeds. High for cooling, & Low for heating. Your thermostat only controls the High speed - switches when you turn your fan on & when there is a call for cooling. The only other thing I can think of is it is possible that the Low speed windings on the blower motor are open causing it to not turn on. Most motors have 3 to 4 speeds & only 2 are used. Switch the heat motor wires in the furnace (on the control board) with one that is on a spare terminal.

Feb 21, 2013 | Bryant Cube Series 1 Stage Heat/ 1 Stage...

1 Answer

I can't find the summer switch on my furnace model FG6RA 072C-12A


there isn't a summer switch - the thermostat will switch the operation from heat/winter operation to cool/summer operation. I.E. "Cool" for Summer and "Heat" for Winter.

Aug 05, 2011 | Heating & Cooling

1 Answer

New honeywell thermostat on new gas furnace not working


sometimes there's a differential setting anywhere from 1-3 degrees, see if you can make sure it's down to 1

Nov 12, 2008 | Honeywell Programmable Thermostat Heater

2 Answers

Rheem furnaace blower stays on


On a furnace the fan is controlled by a computer and a sensor ot a oldstyle fan thermostat. Basically it waits till the furnace heats up a little and then turns it on and after it shuts off it will run till the thermostat cools back down may take a few mins. In cool mode the thermostat controls the fan so it shuts down immediatly. This is why the thermostat asks you if its electric or gas heat. Should have a switch somewhere for this.

Nov 19, 2007 | Heating & Cooling

3 Answers

Blower in Attic not running


inside unit has fan control relay , either on control board or can be separate ,except for the 24 volt transformer and the t-stat the units operate separately concentrate totally on the inside unit this is where the problem lies

Oct 23, 2007 | Ruud UAMB Air Conditioner

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

99 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

paulcarew

Level 3 Expert

2463 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...