Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Mastercool only runs on low speed

Hi, hope I can get some help. the cooler only works on low speed. is their a way we can check the thermostat or is their something else we can check? we already replaced the motor we still got the same results. please help. Thanks Monica

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 659 Answers

SOURCE: 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.

Posted on Mar 21, 2009

  • 4 Answers

SOURCE: I have a Mastercool 2 speed 1Hp 220 volt cooler

Go manual turn switch, sounds like an overload problem. I have a Mastercool unit and going on 12 years with same motor.

Posted on May 10, 2010

  • 587 Answers

SOURCE: high speed does not work but low speed does

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.

Posted on May 30, 2010

Testimonial: "great answer - I'll check it today"

shastalaker7
  • 1515 Answers

SOURCE: we have a champion mastercool

Hi, I am surprised Home Depot didn't have one as this is a very common motor. I don't know where you are from, but if you look on lone for Grangers supply, or Motion industries, they will have this motor for sure. They both are large suppliers of anything you need in this line of parts. This is a very common motor, totally sealed bearings and body with adjustable sheave, ( pulley ). Please let me know what you find. I will be here to help.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Posted on Aug 14, 2010

alpug
  • 1961 Answers

SOURCE: Mastercool evaporative cooler unit.

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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1 Answer

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Not an expert just a home owner. There is a separate wire connections for hi and lo you may have something as simple as a lose wire connections. This happened to us.

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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.

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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

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Could be as simple as the switch, could be as complex as a pole burned out on the motor. If you reverse the connections on the speed selector switch and you end up with low speed and no high speed then you know it's just an inexpensive switch.

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Short cycling can also occur in a thermally protected motor if it is overheating. If the other solution did not work, make sure the belt on the motor is not too tight or too loose. A handy person can check the amperage with an amp probe to make sure it is in limits. The adjust the pulley to put it into specs.

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