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We changed our thermostat to a digital and did not list the wiring diagram before removing the old thermostat. Now the fan will not go off unless we flip the switch on the heating unit inside. It is a Coleman Evcon, from 1994.

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The wire for the fan should be labeled g inside the furnace/ac and is likey green in color. this wire should be on the g terminal in the tstat

Posted on Oct 30, 2008

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1 Answer

Central unit


Seems like defective wiring or thermostat. The thermostat wires needs be checked. Another thing if the ac unit has economizer feature.
With the thermostat removed, if possible wires still connected to thermostat base, jump R-G, indoor fan should turn on: jump R-Y, compressor and outdoor fan should start (may feature a few minutes time delay): jump R-W, heater should start and indoor fan after a time delay.
What you want to see is R-G and R-Y working and if this is no problem, the thermostat may be due for replacement

Jun 21, 2015 | Heating & Cooling

1 Answer

When car is just ticking over it keeps going up to the red i have changed the thermostat checked all fuses but the fan does not kick in i put a wire to the fan on to the battry and it works


Possible that the Temperature sensing circuit or the relay to the fan is faulty. You need to trace the wire of the thermostat to find the sensing unit as unless the unit process the thermostat change of value the relay will not be triggered to switch on the fan.

Apr 23, 2011 | Heating & Cooling

1 Answer

I have 4 wires at thermostat, g, b, w, y. The old thermostat was removed before I owned the house. I would like a wiring diagram so I can trace the wires an know how to hook up. Thx. Ken


Trace the thermostat wires into your furnace and write down which color wire ties on to which letter at the furnace terminal strip. The HVAC color code is - g (Green) = house fan b (Blue) = auxiliary w (White) = heat y (Yellow) = cooling. If you need anything, let me know. And please vote on this response. Thank you.
Roger

Apr 03, 2011 | Heating & Cooling

1 Answer

A/C will not shut off


Hi, the photo is showing a split system, indoor unit and outdoor unit. Is it just the blower fan inside that keeps running, or the entire a/c keeps going? Lets say its everything. I would start at the thermostat and remove the cover to expose the control wires. Find the R terminal,Red wire and use a small screw driver to remove it from the terminal. If the unit shuts off, the thermostat contacts are faulty and you will need to replace the stat. Even though its only low voltage, 24 volts, I would shut off power when you take the wire off. If your stat is not a digital, you will need to remove cover and lossen several screws to remove the stat to get to the subbase and wires. On a digital you don't have to. After removing wire, turn on power to see what happens. If it keeps going, you have a thermostat wiring problem either at the indoor unit where the thermostat wires come in and connect or at the outdoor unit where they connect touching together somewhere. The red and green or red and yellow conductor wires have a bare spot and are calling for cooling all the time. You will have to look for this, it can be very difficult to find unless you can ohm out the wires. If its only the indoor fan running and not the outdoor unit, it still could be the stat, or you have a fan relay that is stuck. If you remove the panel on the indoor unit and look at the wiring diagram, don't let it confuse you, look for this, IDF and follow the wire or wire to FR fan relay. Depending on what type, you can try tapping on it with the but of the screw driver carfully, to see if that may shut it off. If not you will need to go to a a/c parts house or a appliance parts house to find one. Draw a good diagram so you know how to hook the wires back up, or you can get into more of a bind. Its worth doing this then trying to remember. Do these things and keep me posted on this. By removing the R, red wire at the stat will kill power to the fan if the stat is the problem, so you don't have to remove the G, green wire for fan, only the red. I will wait to hear back from you.
Best of luck,
Shastalaker7

Jun 06, 2010 | Ruud UBHC Air Conditioner

1 Answer

Outside AC unit working, but inside there is no air flow and fan inside will not work unless it is turned manually. Also, a little ice on outside unit.


Depending on what type of Thermostat you have, it is usually as simple as setting a jumper for Electric heat instead of gas.
If you have a digital Thermostat then turn off the power to the Air handler and remove the thermostat. Look closely at the small jumpers and make sure your jumpers are set to elect. and not gas so the fan can run in heat mode.
If you have a standard heat cool mercury switch then same as before with the power and unscrew the thermostat, and where the yellow wire is connected if there is a factory with on the yellow, then move the factory wire to the (A) and put the yellow wire back on the (Y).

Good Luck!

Nov 14, 2009 | Carrier Heating & Cooling

1 Answer

Relay board for thermostat/condenser fan/n compressor need to mak


I have a copy of the wiring diagram for this unit. If you would list your email address, I will email the diagram for you. This will give you everything you will need to insure that the unit is wired correctly.

Mar 20, 2009 | Intertherm P3RA-036K Air Conditioner

1 Answer

New thermostat not starting compressor


With the jumper inplace does the compressor start? What about without? Unless you have more than one transformer you should leavethe jumper.

Dec 06, 2008 | Heating & Cooling

1 Answer

Im changing an old honeywell thermostat with a new honeywell thermostat. the old on has wires 4 wires connected to 4 screws C,R,G,W but the new thermostat has a place where the wires go which are...


Yes, I believe that you will be fine. If the original wiring is correct then I have listed the basic wiring below. As always read the directions and make sure the wiring matches your system.

Red wire = Rh (24v power, should have an exsisting jumper to RC)
White wire = W (heat mode)
Yellow (or sometimes blue) wire = Y (A/C)
Green wire = G (Indoor Fan)

Jul 03, 2008 | Honeywell Heating & Cooling

4 Answers

Duo-Therm by Dometic Thermostat


red and white are positive and neg 12v
green is low fan
grey is high fan
yellow is cooling
blue is neg 12v(marked B-)

May 17, 2008 | Dometic Rooftop RV Air Conditioner

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