Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Motor Problem - The MasterCool motor startrd to run on low all the time even when the house control is turned off, If it is turned on and on HIGH it runs for a couple of seconds then turns off then starts running at low. Do I need a new motor OR is it a controler issue??/

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Control box in the unit

Posted on Apr 04, 2011

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Runs fine on low speed hums on high speed (turns slowly) is it a capacitor problem, internal windings or controller?


Motor itself is the culprit.

Capacitor helps the motor to start spinning from a dead stop, so NO, it is not a capacitor problem.

Probably high speed windings. Means - New Motor needed.

Another possibility, is the controller could be sending power to "Both" sides of the windings: High speed & Low speed at the same time. But normally when this happens, you hear a loud buzz type of sound, motor will spin slowly - if at all.

Good Luck

Mar 11, 2015 | Pool & Spa

1 Answer

My mastercool has weak air flow on high cool


Ohm the fan motor and check the run capacitor.

Aug 28, 2013 | Mastercool Heating & Cooling

1 Answer

High speed does not work but low speed does. Is there an easy fix, or will this require a motor replacement to get both speeds working again? The cooler is a Mastercool model MC64C


If your motor only works on low speed and not on high speed first check to see if you have the proper voltage to high speed. Check with a voltmeter or multimeter, check from common on the motor to high speed on the motor at the switch. If you have the proper voltage then you have an open winding on high speed and the motor needs replaced. If you don’t have the proper voltage or any volts, then the switch is bad and needs replaced. This also will be the same if, medium speed won’t work and low speed does.

May 29, 2010 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

Motor does not go from low speed to high speed If the motor is set to low speed it does not turn on until the high speed range is hit then it tries to go from stop to high speed and throws thw belt


MOST OF THE TIME IT IS THE DIGITAL THERMOSTAT OR LOOSE TERMINAL AT THERM. THESE STATS ARE TRICKY TO CHECK. LIKE WHITE ROGERS 4 WIRES CONTROL WITH A RED WIRE TO GREEN YOU GET PUMP WHITE YOU GET LOW YELLOW YOU GET HIGH AND SO FORTH. MASTER COOL DOES IT DIFFERENT SO YOU BUY THEIR TSTAT

Apr 21, 2010 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

Mastercool pump runs when themostat is off.


Check the compressor relay (in the outside unit) Most likely it's stuck.

Sep 12, 2009 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

My motor switches from high to low over and over again


It sound like the low speed winding in the motor is bad.You will need to get a new motor.

Jul 24, 2009 | Mastercool 67680 Evaporative Cooler Air...

2 Answers

Motor sometimes will run and sometimes not


If the motor is still turning, good. It is not burned out. IF the motor is not turning with the unit on, it is either a reset switch (not all units have them) or the motor is burned out. New motors need to have the pulley adjusted so it is not too tight or not too loose.

May 14, 2009 | Mastercool 67471 Evaporative Cooler Air...

1 Answer

Low voltage wires


I just tested a mastercool control box and found these 4 control wire colors:

Red (24v supply)
White (pump)
Green (low blower)
Yellow (high blower)

The yellow acted as a common for testing when the blower was not on high.

Blower on low just green has 24v.
Blower on high green and yellow have 24v.

If there was a fifth wire added hopefully it would be a ground wire.

There was also the low gauge wires that were black, white, and ground that were not control wires and delivered power to the control box.

May 05, 2009 | Mastercool 67680 Evaporative Cooler Air...

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