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Swamp cooler starts up automatically after power outage

We just bought a house with a swamp cooler. Don't know about the make of the cooler, but has a MasterStat thermostat. It runs fine, however, if we have a power fail, when the power is restored, the swamp cooler starts up, even it had been off prior to the loss of power. The thermostat has automatic and manual settings, with a temperature dial. The on-off control is a push button toggle, not a 2 position switch. I can duplicate the problem by switching off the power to the house. I've tested it with the control in auto and manual, with the unit off. No matter what, it starts up when the power is restored. Do we need a new thermostat or is this some kind of electrical problem? Thanks.

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  • npread Aug 04, 2009

    Haven't tried disconnecting the tstat yet. When I was last there, I had pulled the front off, which removed the button controls, and found 4 fine wires that apparently match up to 4 pins on that front panel. Didn't think to try the power test without the front of the tstat. I can try that next time I am in the house. I'll be sure to have an ohmmeter on hand and will also verity the wiring behind the tstat.

  • James Stopp
    James Stopp May 11, 2010

    If you disconnest tstat and trun off power does it have the same problem. Russ

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Generally ther thermostat is the "brain" of the system, check the wiring diagram (if there is one) or the wiring and see if the on off swtch is inseries or parallell to the thermostat, (should usually be in series if it is I would say that the on off switch is the culprit. you cna verify with an ohmmeter to see if it is staying in the closed position.

Posted on Jul 19, 2009

  • cwithnell Apr 28, 2011

    If the power is on to the unit then it is summer and the cooler should run when the thermostat tells it to. After a power outage the temperature usually rises inside the house, therefore the cooling is required to run. It is designed to turn on automatically after a power outage. If you don't want it to turn on then turn off the power switch. If the system was not installed with a power switch (depends on local codes but most require them) then turn off the circuit breaker.

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