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Coleman-mach furnace will come on and heats well but will not turn off unless manually turning off the thermostat. Is the thermostat not working?

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6ya6ya
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Posted on Jan 02, 2017

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koolbreezes
  • 540 Answers

SOURCE: problem with heat pump

This sounds like a 4--step furnace. Step 1 ,the small ven fan turns on and proves it turnning thru the small air tube that sucks a switch close . Step 2 the spark igniter lights the pilot ...Step 3, the main gas valve opens up and dump gas in the venture tubes to heat the box up, Step 4 theres a swith in the box the when heated closes and turn the fan on! Thank-you-very-much!

Posted on Aug 28, 2008

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  • 5 Answers

SOURCE: Coleman unit, no heat or air, only fan runs.

check for wiring & compresor

Posted on Apr 06, 2009

  • 20 Answers

SOURCE: we have a Mach III coleman AC unit... a little

Sounds like the evap coil is dirty or its low on freon.

Posted on Aug 31, 2009

koolbreezes
  • 540 Answers

SOURCE: i have a white rogers thermostat, it wont click on

Did you connect the jumper wire to rc---rh on the thermostat?

Posted on Dec 08, 2009

atocrxr
  • 135 Answers

SOURCE: The thermostat clicks but the a/c won't turn on. I

You need to check the breaker for the A/C in the electrical panel, and have the fuses in the disconnect located near the A/C outdoor unit.

Posted on Apr 04, 2010

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1 Answer

I have a coleman furnace model 4066A656


Make sure your air filter is clean. Is the thermostat satisfied? or is the room temp. still below the thermostat setting? When ever you have to turn the power off and then back on to a furnace that usually indicates that the furnaces ignition control locked out. The first thing that I would try is cleaning the flame rod.

Mar 02, 2017 | Coleman Heating & Cooling

1 Answer

No fan when ac kicks on Ihave a eb15b funace with a coleman ac


The heat will normally use a low speed on the fan, & the AC along with the fan switch on the thermostat will use the high speed. The thermostat turns that high speed on when there is a call for cooling & is the same switch if you were to manually turn the fan from auto to on. Try turning the fan on @ the thermostat. If it works, then replace your thermostat. If it doesn't, it could be a bad fan speed, a bad fan relay on a control board or external relay, or a loose or broken green thermostat wire.

Apr 14, 2014 | Coleman Home Electric Furnace Eb15b/Eb15d

1 Answer

Coleman mach furnace wont stay running. i turn the thermostat down until i hear it click, then i turn it back up to get the furnace to kick on.works sometimes and sometimes not. blower will always kick on...


Hi, I don't know if you are still having a problem, but it sound like the flame sensor on the unit is dirty and need to be cleaned. If it has a automatic pilot, it will have a flame sensor. Its made of porcelin with a metal rod coming out the end, laying next to the pilot flame. Just 1 screw holds it in place. Remove it and clean the tip with steel wool or a piece of sanding cloth. If you don't have this set up, I would need more info on the unit, model and serial number. You may also have a faulty thermostat, but I do believe it is a flame sensor.
Shastalaker7

Nov 21, 2011 | Coleman Mach III Air Conditioner

2 Answers

RVP 8000 A/C just experienced slight power surge. Compressor on.


I'm leaning toward sticky relay as well, but if you want to confirm it's not thermostat, remove thermostat from wall, and temporarily disconnect the yellow wire from thermostat (compressor) when/if, it happens again. If compressor stays running, I'd say relay for sure.
Just for future reference , Gray wire from thermostat is low fan, green wire is high fan, yellow is compressor, blue is ground. ( For cooling side) The red is 12 v + to furnace and white is negative to furnace.(heat side)

Jun 10, 2010 | Coleman Mach 15 Air Conditioner

2 Answers

Have atwood furnace and coleman mach thermostat and it would not shut off. I unplugged power to rv and had to hit battery disconnect so that it would stop.waited few minutes...turned on...heat would not...


It may be your thermostat, but try this first to see if time delay relay may be sticking. When it won't shut off, turn propane off, and go outside and unscrew the 2 screws that hold your cover on, and lower the cover down. Look straight ahead, attached to the housing of the fan up near top you'll see a square relay (time delay relay) with 4 male spade connectors, and wires attached to each. It's usually held on with 2 Philips screws. Give it a little rap with the handle of a screwdriver or similar a couple of times, and see if fan stops running. While your there as well, pull the wiring connector off the ignition board, and put back on a couple of times, to clean the connections. Now try it again, and let me know what happens.

Apr 23, 2010 | Coleman Mach III Air Conditioner

2 Answers

Coleman roof top a/c, is the heat controlled by thermostat


hi
on the new colman units (trane) the heat is control only from the t-stat.
i will reccomand a programble t-stat for the new unit.

thanks

Nov 02, 2009 | Coleman Mach III Air Conditioner

1 Answer

Air conditioning runs all the time


I assume this is a manufactured home, this is probably a two transformer system, either your contactor is welded in the on positon or wyou have control wiring issues, (could be the thermostat)

Jul 12, 2009 | Coleman Heating & Cooling

1 Answer

Problem with heat pump


This sounds like a 4--step furnace. Step 1 ,the small ven fan turns on and proves it turnning thru the small air tube that sucks a switch close . Step 2 the spark igniter lights the pilot ...Step 3, the main gas valve opens up and dump gas in the venture tubes to heat the box up, Step 4 theres a swith in the box the when heated closes and turn the fan on! Thank-you-very-much!

Aug 18, 2008 | Coleman Mach III Air Conditioner

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