Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Mastercool control box p225101a schematic

How can I get one? My fan sometimes sticks 'ON' which tells me that I have a relay sticking. I don't know if this is a solid state unit or has relays.

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Posted on Jan 02, 2017

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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

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

thermostat-heat-cool-fan-on-czwsw2ci0layswcsyy3dj4dr-4-2.jpg

basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

Jun 28, 2017 | Bryant Heating & Cooling

1 Answer

Why wont the fans turn off? we had a new radiator installed and therasat.


if the car does not call for more cooling. then it may be a bad relay in distrubution box, or a bad coolant sensor. the fans are controlled by the pcm ( powertrain control module ) it gets its info from coolant sensor. that tells how warm or hot coolant is. try the relay first it may be sticking closed. have a good new years !!

Dec 30, 2010 | 1996 Nissan Sentra

3 Answers

3.8litre ,electric fan continues to run killing battery.doesn't happen all the time.


It is most likely the fan relay is sticking and allowing the fan to run on, the relay is plugged into the fuse/relay box on the drivers side of the engine compartment.

Sep 30, 2010 | 1999 Buick Regal

1 Answer

Fans wont turn on. tried 5 relay replacements but did not work. i can start the fans by jumping them with a wire in the relay jacks.(the original and the other five relays were working properly. tried them...


Check the fan switch at the bottom of the radiator. These are a bimetal device and sometime stick with age. The switch turns on the relays. Check that the switch does have +12v power on one side. If not, trace the power problem. It runs back to the main junction box. Connections on the bottom of this box get corroded.

Sep 07, 2010 | 1993 Eagle Talon

1 Answer

Sensor shows F6


The F6 error is indicating a stuck relay on the microwave control board.
Without knowing the age and frequency of usage,
It may just be a pitted contact on the relay, but usually they are soldered in place, and are not serviceable unless you are handy with a soldering iron and the safety factors with taking the metal shroud off a microwave.
sometimes... and this is sometimes...a good jarring will shake the contact loose.
I don;t know if this is a electro-mechanical relay or a solidstate relay... either way... if it sticks once, it will stick again...

May 17, 2010 | Kenmore 60654 Microwave Oven

5 Answers

Cabin fan continues to run when key is out of ignition


Blower relay switch is sticking. Replace a/c heater relay switch located inthe fuse box under the hood.

Oct 07, 2009 | 2004 Saab 9-3

1 Answer

I have 1996 Dodge caravan and the fan's come on and stay on


By chance are you saying the fans stay running when you turn off the engine, the problem is with the radiater fan relay, the points are probably sticking together, it's in the pdc box under the hood, power comes from fuse 4, 40 amp, through the relay, then to the fans, relay is controlled by the engine controller (pcm). just flip the cover and find the right relay, pull it out when they wont shut off, if it quits, swap it anouther relay from the pdc box, and test it again, fans come on at 212*F and shut off at 199-202*F. if the fans stay running while engine is running, you might have a coolant sensor issue, or cooling system issue. If you need more assistance, let me know. GOOD LUCK, RDJRP

Oct 01, 2009 | 1996 Dodge Caravan

1 Answer

Master cool controller failed


generally this is a 115/24 40 va transformer, as long at the VA rating and mount is the same you can source a universal.

Jul 18, 2009 | Mastercool 67680 Evaporative Cooler Air...

2 Answers

2006 Chevy Avalanche climate control fan won't turn off. Even when the engine is off. I must remove the fuse to keep it from running.


Their is a relay/ fuse box under the hood thir is a relay that is probbly sticking corrison on the contacts inside is a commen problem remove the relay and try switching it with a twin relay that controls somethig else in the box and see if it shuts off the fan if so replace the relay avalible at most auto part stores.

May 22, 2009 | 2006 Chevrolet Avalanche

1 Answer

Need a wiring diagram for mastercool evap 2 stage unit


I have the wiring diagram in the cooler. I can photograph and send it to you. Do you still need it?

May 12, 2009 | Heating & Cooling

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