Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Mastercool evaporative cooler unit. I need a new relay switch. The fan motor will only run on high. When I put the main unit to low speed, the motor does not run. I swapped motors and the same result. My unit type is model no CHC??1A the ?? numbers are not readable. (a second unit put in at the same time but downdraft instead of draft is a model number CHC631B) Can you help? Thank you!

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Check this web site for spareparts of your evaporative cooler

http://www.indoorcomfortsupply.com/Evaporative-Cooler-Parts.htm

let me know!l

Posted on Apr 03, 2011

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Posted on Jan 02, 2017

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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

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...

1 Answer

Mastercool swamp cooler fan doesnt come on.


Are the relays perment on the board or are they seperate from the main board? If they are mounted to the board, you will need to replace the board. Sounds like you are getting a call to the relay but none leaving so this would indicate that you have a bad relay switch.

Mar 20, 2009 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

Auto does not work right.


1. remote problem
2 change by new one.

Mar 25, 2008 | Mastercool 67680 Evaporative Cooler Air...

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