Question about Coleman Mach III Air Conditioner

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We have a tioga, the furnace would kick on but not always blow hot air. We took it in for service to replace what we thought was going to be sail switch and they replaced the thermostat. We picked up only to find our fuses blown and now our computer board is blown and the generator wont run. im guessing they shorted somethnign when they changed the thermostat but they say not possible please help.

Posted by michelle on

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5 Related Answers

farfield

Farley Redfield

  • 462 Answers

SOURCE: thermostat

Several things cause fuses to go. But you ace in the hole is that it works for sometime before it goes out. This suggests that a relay or contactor is not pulling in as it should. I would try replacing the fan relay (if so equipped) and definitely the compressor contactor. If either of these try to pull in and are off center internally the result can be blown fuses intermittently.

DO NOT GO ABOVE 5 amp fuse or you may burn out the transformer.
The other things that can cause a blown fuse intermittently where your describing (although less likely unless subject to rodents and or high or low voltage spikes)
1 a temporary short in the control wiring (wire to or from the thermostat).
2 A short intermittent on the control board (if so equipped)
3 A relay on the control board or the SS circuitry is not operating with in design parameters.

I would really like to know what you discover the problem is.

If this helped you understand your system or problem please rate me as high as you can and thank you for using fix ya. Good Luck.

Posted on Mar 27, 2009

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Dan Favata

  • 233 Answers

SOURCE: 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)

Posted on Jul 12, 2009

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Therinnaiguy

Chandler Ede

  • 1420 Answers

SOURCE: thermostat keeps blowing fuses

There is a short in one of the thermostat wires. The fuse is triggered on the low voltage side of the unit. Replace the wires.

Posted on Feb 09, 2010

Testimonial: "Thanks for the info ,I will try this"

taran_2005

taran_2005

  • 10515 Answers

SOURCE: Our inside unit Coleman EB20B (outside unit

Hi,

Mark all your wires using tape or by writing it down to ensure you will be able to hook them back up exactly the way you found them. Remove all the wires from your board again. Tape off the ends so you don't "short" anything together. Identify the wires going to your outdoor unit and the wires going to your thermostat. Hook the wires up one at a time starting the with C wires and the R wires. Then hook up G. Then W. Then O. Then Y.....and any other wires you might have. Check the fuse everytime you hook up one of the wires. Remember to do the tstat and outdoor unit wires one-at-a-time also..........meaning........you will have 2 "Y" wires. Hook up only one, then check the fuse, then hook up the other, check the fuse...........Eventually, that fuse will blow again when you hook up the right wire. Then you will be able to determine the color wire and whether it is the one for the tstat or the outdoor unit. Once that is determined, disconnect that wire at the other end and re-install the fuse and restore power. If the fuse blows, the problem is in your wire. If it does not blow, it is most likely a bad control coil. More often than not, it's the wire. Look for damaged insulation and "crimps". Usually the repair can be made with simple electrical tape and/or cutting the bad spot out, using a wire nut and electrical tape, and testing it again.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Sep 19, 2010

shastalaker7

Robert Horton

  • 1515 Answers

SOURCE: 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 kic

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

Posted on Dec 01, 2011

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