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Can't get heat out of the furnace

The pin does not come out of the furnace for us to switch from cool air to heat

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Re: can't get heat out of the furnace - Air Conditioners

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Posted on Jan 23, 2008

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Will be to clean each contact-switch and scrape the contacts and use wd40 and spray of air and remove all rust, its possible that exist another options of failure.

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Furnace fan will not turn on when in "Auto" mode. If switch to "Manual" mode on thernostat, fan will come on, but doesn't blow warm air.

depending on which make aand model of furnace the heating blower relay or heating blower switching device could be bad when you switch the t-stat to manual or on that energizes the cooling blower relay is it gas or electric?

Dec 28, 2010 | Air Conditioners

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I have an Intertherm electric furnace in my mobile home model # FEHB 015A. The heater started acting up by first blowing warm air like normal but then blowing cool, not heated air after a few minutes of...
The diagrams above may not be exactly what you are needing. But they will be close. Usually the diagram for the furnace is on the inside of the blower fan door. Two things come to mind. It seems like your limit switch(s) are cutting out, then in, then out, etc and may have failed totally. These are in the system to prevent the temperature in the furnace from getting too high. Why they are cutting in and out may be due to the lack of sufficient air passing through the furnace. This can be caused by, 1. the fan speed is too slow, or 2. the air filter is needing to be changed. I am not sure how proficient you are with electrical troubleshooting. I would (turn off all power to furnace) find the limit switches (usually at the top of the heating elements) and check to see (with an ohm meter) if the switches are allowing the meter's current to flow through them. Your meter should read near zero, if not, then I would replace the switch with an exact one. If you are proficient with electrical troubleshooting, I would place the furnace in the "call for heat" position, with the power on, (be careful, this stuff can hurt) and I would see if I have voltage at the heating elements, and I would check with my voltmeter across the two leads on each limit switch if there is voltage present. If there is voltage present, then the switch is probably ****.
Depending on the furnace you have, you might have a number of switches that control the heating elements, these units are usually time delay and if they fail, you should replace them with the same delay time. I hope this helps.

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Here is the service manual with wiring diagram.

Dec 19, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

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Blower stays on after heat goes off

when the room thermostat is satisfied it stops the heat by stopping power to the sequencer or contactor which is in series with the heating element/s...the TEMPERATURE OPERATED FAN SWITCH then takes over the blower until the heaters cool

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Heat pump

What type of furnace? strip heat....gas... I would check the reversing valve.Run the unit in cooling have someone switch the stat to call for heat....."Whooosh!!!" the reversing valve will switch over.Other methods of switching the valve , remove one wire, remove the nut and slide the solenoid off the valve will reverse. The switching solenoid can be checked magnetically by using a small screwdriver. Switch from cool to heat or heat to cool this way you can check if the valve is getting a signal .
Heat pumps are a fairly complicated simple device..... sometimes just switching the valve back and forth a couple times gets it unstuck. Remember air coming from the duct will feel cooler than air from a gas furnace .
Most customers don't think they are working when they really are. 100 degree heat is not that hot to 98.6 degree person who is used to 120 degree gas heat!

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Does the new stat have a pin labled (G)? Connect your fan wire (usually green) to that pin, and then call for fan on your therm. Straight heat stat means it has only heat and cool pins, there is no option for fan. If your not getting the fan to come on including heat, make sure you have the white wire and red wire connecting to your new stat.

Dec 06, 2008 | Air Conditioners

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 | Air Conditioners

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