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My bonaire evaporative cooler cycles from high to low fan speeds when set in the cool mode. It works fine at the required speed setting when just the fan (no water) is selected. It also dumps water immediatly the cooling cycle is turned off rather than holding it for about 40Min as it should. Sounds like a controller problem, but I'm not sure if it would be the touch pad or the board up on the roof mounted unit.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 121 Answers

SOURCE: Front unit high cool and high fan not working

I would recommend you take this unit to an RV service center. The issue could be due to many variables. It could be something as simple as the controller board relay or a low freon level. You may also be able to call a regular home heating and airconditioning shop to take a look at the unit. Keep me posted and if you found this solution helpful please rate it when you get a chance. Good Luck - Tech101

Posted on Jun 25, 2008

  • 1 Answer

SOURCE: AC pad not fully getting saturated with water

1. Make sure the pump is getting plenty of water.

2. Make sure the pump is working.

3. Check the pvc pipe with drip holes are not plug. (above the pads )

4. Check the pads directional arrow that should be facing up. When pads are initially installed you can see arrows on the pads. The arrows should be in the up direction. That will allow the pads to get saturated more efficiently.

I hope these steps help you.

Jerry,

Posted on May 08, 2009

  • 1 Answer

SOURCE: fan works on all speed, and low cool is working but does not change to medium or High

i need a wiring diagraham for a duo-therm mod# 54812-136

Posted on Jun 22, 2009

james3751
  • 614 Answers

SOURCE: This is a heating and

You have a bad board or bad switch. I would say board. You can have service tech check this out. There is only so far you can go without knowledge of Controls ad electricity. Russ

Posted on Jul 22, 2009

jeffbvegas1
  • 520 Answers

SOURCE: need replacement pads for mastercool mrc55wa

These pads are available in different sizes and styles at home improvement stores like LOWES or HOME DEPOT (in season)

Posted on Sep 18, 2009

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1 Answer

Engine cold. Start engine reading says engine hot ac off. Fans run all time.


Are the fans running on low or high ?
Circuit/System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the fan low relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the fan low relay, which is fed by the fan 1 fuse. The right fan is connected in series to the left fan through the de-energized fan control relay so that both operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the fan low relay, the fan control relay , and the fan high relay. On the fan high relay, the energized coil closes the switch side of the relay and applies voltage directly to the right cooling fan through the switch side of the relay, which is fed by the fan 2 fuse. At the same time, the ECM energizes fan control relay pulling the switch side over, providing a direct path to ground for the left cooling fan, which has voltage applied through the energized fan low relay. In high speed mode, the fans are operated as a parallel circuit with full voltage applied to each.
You should have it hooked up to a scan tool that can read engine sensor data parameters . Check for DTC'S - diagnostic trouble codes etc...
Circuit/System Verification
  1. If DTCs P0480 or P0481 are set, perform those diagnostics first.
  2. Ignition ON, verify with a scan tool that the control module is not commanding fan activation.
  3. Ignition ON, observe that the fans are not activated.
Your best bet is to take it to a ASE certified repair shop !

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1 Answer

Why is the fan only running on low speed?


Hi David. when the air conditioning is energised by the thermostat it should automaticly bump up to high fan speed, if it has been running for a while it ciould be freezing up the evaporator and causing a restricted air flow to come out. you may need to shut the cooling mode off and just leave the fan running for a few hours. hope this helps

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This is a Unico AIR HANDLER in a residential application with heat / cool unit in the attic. With system off (not calling for cool) and fan in auto mode, the blower fan is on high speed only constantly....


Sounds like a sticking relay. You can check the stat simply by remove the faceplate. If fan still runs with tstat cover off its not the stat. Not sure is your blower has a separate relay or if relay is mounted on control board. This can be bypassed with a new relay if you are willing. Good luck!!

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Can i install a time temp. type defrost control instead of the demand defrost type in the above unit? also i see no reason for the fan control board (low to High speed) since the fan motor does not call...


Defrost timer might be more reliable here in NY I set them @ 45minutes..The fan speed is out side tempature (ambient) selected ,low speed, running when its cooler out but you still use cooling.HIGH speed being the default speed.High/low during spring and low all winter.If your new motor is only one speed power it direct from the contactor

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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.

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

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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

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Evaporative Cooler Bonaire Profile do you put water in this item? or does it cool alone, it has a cool setting with a water drop sign?? besides the fan function


Yes, it does require you to pour water into it from the back opening (where the aspen pad is located). I have one myself it works well on days up to 35degrees, the other temperatures higher it just acts as a spot cooler.

Thank you for submitting, and Happy New Year

T.Scott

Jan 07, 2010 | Heating & Cooling

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Fan will not run on high. Compressor runs fine but the fan will not run on high. Works fine on low and med.


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Aug 01, 2009 | Coleman Mach III Air Conditioner

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Fan is slow


I dont have a solution, but I have a similar problem with a Bonaire evap rooftop cooler which only started after a tech came to look at the unit when it stopped operating properly last summer. He said it uses less water now, but the issue is that it doesnt cool any where near as effectively with the fan speed so low. I am located in Melb Australia, and wonder if you are in the same area. I am going to call service AGAIN & get the minimum fan speed returned to what it was previously. I wonder if my original unit is too small for the house - but nevertheless, it used to work beautifully and now is a very poor example of evap cooling. The service guy said the base fan speed could be altered from the controller, but we dont know how to get into the setup menu.

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