Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Mastercool pump runs when themostat is off.

Mastercool pump runs and wets the pads when my control box is turned off inside the house. To stop the pump, I have to go outside and turn off the power to the unit. Why is this happening?

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  • 11 Answers

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

Posted on Sep 13, 2009

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Posted on Jan 02, 2017

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your house is wet because of the difrnens beetwin the temriture inside and the temp outside spesialy if its airconditonerd at that time of the year . Put aircnd higer temp or buy a drier.Another solution is to eqelize the out temp with the in by letign a window slitly open

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Could be that the float is not set properly to where the water shuts off when filled. Make sure that you adjust the float so that water doesn't spill outside the pan when the unit is turned off. But that enough water is available so that your pump has enough water to feed the pads. If you run the pump dry, you may overheat and ruin it.
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Louis, The cooling does not come from the volume of water running over the pads. It cools by cooling the air passing through the wet pads. So, Yours is an impeccably logical argument that leads to a false conclusion. Bigger is not better in this caThe fishy smell is from the matting (pads) when kept saturated, Molds and algae will form if there is too much water also.. Best you get the original size pump Good luck and stay cool - Ned

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

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If there is strong air flow blowing into the house the sq. cage should be OK. Possibly you need to replace the pads and make sure that the pump is not clogged and is distributing enough water to keep the pads wet.

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