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Coleman furnace problem

On Heat mode, when blower motor comes on, cool air comes out of the registers and fan is noisy. I think the hi speed comes on instead of the low speed. there are three wires going to the blower motor, Red, White and black. All are connected to the terminal which are marked R W B correctly. Can anyone tell me how to correct this problem? Furnace is a Coleman reverse flow 5600 BTU DGAA 070BDTA Serial No.001115253

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Sometimes people replace the blower motors with a higher horse power. Has this motor ever been changed? I believe the original should be a GE motor

Posted on Jan 28, 2008

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Posted on Jan 02, 2017

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3 Answers

Coleman Evcon furnace blower runs w/ no call for heat. Temp is 5+ degrees above thermostat setting. (Programmable tstat)


When you say door are you referring to the front door or the furnace door? If the unit kicks on AND off by itself I would say it's in the tstat or the tstat wire. If it were internal I would think the blower relay or heat contactor/relay were getting stuck AND THE FAN WOULD NOT TURN OFF until you flipped the breaker. Good luck

Mar 21, 2017 | Coleman Heating & Cooling

Tip

Furnace Troubleshooting


On some natural or LP gas furnaces, the blower motor has to come on 1st
and then shuts off. This process starts the inital call for heat. If you find
yourself without heat and the blower does not run, turn the furnace to on
at the thermostat.

When changing the fan to on, you are changing the speed, if the heat comes on, that means you have a burnt out speed on your blower motor.

If nothing happens, change the fan speed at the control board.
In some instances they may be using the same blower speed in both the
heat and cool mode.

on Jan 19, 2010 | Heating & Cooling

1 Answer

Can not get fan on to turn on. All else fine. heat only furnace. No air conditioning...only air circulation.I used to set it on "Cool" and "Fan On"and get air to circulate. Do I need new thermostat?


Since you have two thermostats that operate the heating unit and the fan, and the fact that neither will turn the blower on, I would suspect the furnace/ air handler. Turn the thermostat to heat and see if the heat and the fan comes on, if it does operate normally in heat, the fan relay or the high speed on the blower is most likely the culprit. (If the furnace is equipped with a circuit board, the fan relay is integral to the board, if it an older furnace it has a separate fan relay). If it does not operate normally in the heating mode, verify power to the furnace, see if the flame comes on, if it does: the fan motor, circuit board or the fan relay are most likely the cause. hope this helps!

Jul 20, 2015 | Heating & Cooling

1 Answer

Auto fan does not start electric furnace


see this causes and fix it. God bless you
If the furnace won't run, check the electrical service panel for a blown fuse or tripped breaker. Also make sure the power switch on or near the furnace is turned on. Check the unit for a reset button and try it. Some units have a built-in breaker or fuse panel.
If there is not enough heat, raise the thermostat setting five degrees to see if it turns the unit on. If the unit still does not generate enough heat, check the comfort controls . Clean or replace a dirty filter, clean the blower assembly (see the Forced-Air Distribution Fix-It Guide), and make sure that all registers are open and not blocked.
If the furnace turns on and off repeatedly (cycles), clean or replace the filter; and clean the blower assembly (see Forced-Air Distribution Fix-It Guide).
If the furnace is noisy, make sure access panels are mounted and fastened securely; spray squeaking belts with fan-belt dressing and replace worn or damaged belts; adjust the blower belt; lubricate motor and blower oil ports.
If the element does not heat, refer to the Heating Element Fix-It Guide for guidance.

Oct 08, 2012 | Coleman Mobile Modular Home Electric...

1 Answer

Loud blower on my Coleman Furnace


Usually a noisy blower motor is a bad bearing. The motors now have oil impregnated bearings and you can't oil them, you have to replace them.

Sep 19, 2012 | Coleman Mobile Modular Home Electric...

1 Answer

Flame comes on in burner. Fan in auto does not come on , Fan in manual does. I figure the switch to tell the fan the box is hot is bad ?


Ken,
First of all what kind of furnace is this?? always post model and Manufacturer of furnace. This helps us techs. narrow the problems down ok. Next, It sounds to me like maybe the blower motor itself might have a bad winding it it, or not coming on in the heat mode. This is because when in heat mode the blower is in a different speed, and when you switch the auto/on sw on the t-stat it switches the blower to usually the high speed winding or (cool) speed which is usually the black wire on the blower motor. the heat speed is usually the red or orange wire slower speed for heat. check these first then you may have to go back to the furnace control board. and check if it is sending voltage to the fan motor itself.. hope this helps..
hvac tech..
zac

Jan 20, 2011 | Heating & Cooling

1 Answer

When turning on heat after a period of using air


It sounds like the fan limiter switch is going bad. This switch waits until the air temp is high enough for heating the house before allowing the fan/blower to come on. There is another switch that shuts off the blower when the air drops to a certain temp, or it may be the same switch that does both jobs. Hope this helps.

May 09, 2010 | Omega Trane Furnace Draft Inducer Blower...

1 Answer

We have a coleman evcon furnace. The furnace runs constantly. It'll get to the temperature but then the fan doesn't quit and it only blows out cool air the the reset switch pops up and needs to be be...


It sounds as if your furnace is exceeding the limit tempperature of the manual reset switch. The coleman is designed for the fan to continually run when this limit switch is tripped in order to keep the heat exchanger cool.( it is a safety feature) afew things may be happening.
1. the manual limit switch( the one you have to push) may be defective.
2. The fan may be running at too low of a speed. Turn power off at circuit breaker. locate circuit board on the board there will be one terminal that says heat if the red wire from the blower is on it tthen you may need to up the speed. follow the wires from the blower to the board if it has multiple speeds then you can isolate the red and put the blue or orange on the heat terminal.
3. the board may have an adjustable fan on and fan off pin selector if it is set up to come on to long or go off to soon it may not be controlling the temp of the heat exchanger properly.
4. I would also suggest checking to see if the orifices and gas valve are set up for your sytem correctly.
these are just simple ideas let me know how things go.

Oct 15, 2008 | Heating & Cooling

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