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We have a Honeywell RTH230B programmable thermostat installed on a rudd a/c system. Everything works fine except the a/c unit cycles on and off about every 5 minutes.

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Probably cycling on low or high pressure switch. You may be low on refrigerant, dirty filter or indoor coil, causing low pressure switch to open or the outdoor coil is dirty or outdoor fan not running at the proper speed causing the high pressure switch to open.

Posted on Jul 04, 2010

  • caroline Jul 09, 2012

    This answer is wrong. the problem with these models is that they use a very small tolerance of .9 degrees, instead of a couple of degrees like you are used to. They are thus very ******* your systems as well.

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HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
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Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
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