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enter image description hereMy attic fan coil unit (MBX-HW) fan will short cycle in heat mode. On for 20sec off for 20sec. Worked fine in cool mode last Summer. Replaced the filter, thermostat replaced 2 years ago. The heat is or seems to be maintained as my wife isn't complaining :) Unit is easily accessible. Any input would be appreciated.

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    Has it always cycled like this or is this something new? Check that the thermal cutout switch is clean. – JACK Jan 18 at 15:44
  • Hello, and welcome to Home Improvement. We'll need more info before we can help you. And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Jan 18 at 17:01
  • Thanks for the reply, much appreciated, where is this switch located. – teamtruett Jan 19 at 18:09
  • I have a picture of what I think might be the thermal cutout switch, can pics be posted here? I do not see an option – teamtruett Jan 21 at 15:10
  • I added the pics to my original post, thanks – teamtruett Jan 21 at 15:13

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