Question about Coleman Mach III Air Conditioner

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A/c not cooling

Fan run on auto not getting voltage to comressor from rely.

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The rain in Spain falls mainly on the PLain! WHAT WHERE WHO WHEN WHT ????

Posted on Aug 28, 2008

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1 Answer

How do i stop the supply fan


Check fan switch, if in On position fan runs continous Auto position, fan cycles with heat /cool. If in Auto than fan relay,logic board failure or short in wiring.

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I have a Dometic Duo-Therm model no. 59516.531 AC. The fan runs slowly and the seems to run but doesn't cool because the fan doesn't run fast enough. Any help on where to start?


try testing the capacitor for the fan if there is one. if there is multiple speeds on the fan motor see if it is getting the correct voltage to the motor if it is getting reduced voltage it will cause it to run slower. U can find the max voltage on the side of the motor and just test the motor by making up a lead if u can.

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How to wire contactor on Sears ac condenser style 36LC-000087CR


The contactor for the compressor and outdoor fan is activated by your thermostat when you call for cool. The small coil is an electromagnet that gets 24VAC when you call for cool at the t stat. The red wire in your T stat connects to the blue (or sometimes yellow wire) in the t stat completing the 24VAC circuit and closing the contactor. The line voltage is supplied to the poutdoor fan and compressor upon the contactor closing.

You can manually pushthe contactor close and the outdoor fan and compressor should start. Do this with your hand on the insulated portion of a screwdriver and take the tip of the screwdriver and push the contactor closed. The compressor and outdoor fan should start. That tells you that you have a thermostat to contactor coil issue if the t stat does not close the contactor when you call for cool.

Aug 03, 2011 | Heating & Cooling

1 Answer

To turn on the air conditioner, on the thermostat do you click it to Auto and then on the other side click to Cool? Or do you click on Fan and Cool?


If you put the fan to auto, the fan will run only when the compressor runs. the other position it will run untill you switch it back to auto. Then cool unless you require heat at night or in the morning, usaually when I start cooling season the heat stays off.

Jul 05, 2011 | Honeywell Heating & Cooling

1 Answer

Thermo set "heat" and "Auto


Check the fan relay. These relays are used to cut the fan on and off when the thermostat is set in the air conditioning or heating mode or when you move the thermostat to the "Fan On" position. The low voltage usually the green thermostat wire is wired to terminal #1. The low voltage common wire to terminal #3. One line voltage wire is attached to terminal #4. The high speed blower wire usually black is attached to terminal #2. When the thermostat calls for air conditioning or "Fan On" the 24 volt coil is energized, the terminals 4 and 2 close. This causes the fan to come on in high speed. When your home cools down and the thermostat cuts the air conditioner off, the low voltage coil terminals 1 & 3 are denergized, and the fan goes off. Sometimes these little relays stick which causes the fan to run all the time or will not make good contact, which causes the fan to not run in the "Fan On" or air conditioning mode.

Nov 16, 2010 | Weather King 10AJA6001AH Air Conditioner

1 Answer

I need help with a buzzing sound in my air conditioner.


It is probably the compressor humming. They can make some funny noises especially on start for a while. If the unit is not cooling it may be the start capacitor or the comressor may be locked up.

Jul 19, 2010 | Goodman CLQ36AR49 Air Conditioner

2 Answers

Goodman a/c blower runs on auto and humidity problems


Is the air cold inside? You are talking about the fan inside? Have system check for freon but more than likely, it sounds like a t'stat problem. And it's not normal for the fan to run constantly.

Jul 05, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Coleman rv rooftop unit, fan runs in on but in auto nothing works


R = HOT 12V
W= WHT- GND
Y = YELLOW / POSSIBLE THERMOSTAT
G= GRND FOR THERMOSTAT
f = FAN
F=FAN
aSSUMING THIS IS A TWLVE VOLT SYTEM- The two f's Would be fan control intake and exhaust - fan direction
White is always ground and so is green.. green is more of a static ground where white is a load grnd.
Red is always hot. in low voltage

I hope this helped. No instructions in kit?

May 18, 2009 | Coleman Mach III Air Conditioner

2 Answers

Fan will come on for heat(auto), but not for AC or set to ON


You have a blower relay in the furnace that's probably bad. In the heat mode the blower is on a temperature relay, in cooling mode the blower has to come on immediately so there is another relay for cooling. The green wire on the thermostat feeds that relay, so if you go to the furnace and shut the power off and find the green wire from the thermostat that feeds that relay and replace it, being careful to mark all the wires before removing them, also the relay terminals have numbers for identification.

Apr 07, 2009 | Heating & Cooling

1 Answer

LG LSB24X1RPL1 split a/c compressor fan not working


It is probably the control board but you will need to use a volt meter to check for voltage leaving the harness that goes to the fan. Make sure that the unit is calling for the comressor to come on. If it isn't, then it's probably the board and if it is, then the motor may be bad.

Mar 30, 2009 | LG Heating & Cooling

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