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I turn off my Honeywell cm901 thermostat but the radiators remain on

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4 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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billyvangogh
  • 108 Answers

SOURCE: need to wire a honeywell RTH7400D thermostat to 3 wire hot water

Just mark the old wires on the old thermnostat...R , W etc...and put them on the same terminals on the new 1.....also there should be some adjustment ire : switch on the back or under the cover to adjust for Hot water heating or electric heat...either is the setting you should have it on....also you shouldn't setback the thermostat at night or when away very much....2 degrees is fine , as the boiler will run along time to raise the temperature in the morning and may not get there by the set time

Posted on Oct 26, 2009

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FurnaceGuy
  • 74 Answers

SOURCE: I have a Honeywell Chemotherm III. The thermostat

The thermostat may be getting a little old, but I do not think that it is your problem. Look for flash codes on the control board of your heater. This should give a few clues as to what it could be.

Posted on Jan 04, 2010

  • 207 Answers

SOURCE: My Honeywell thermostat is turned right down to 10

sounds like ur tstat needs replacing

Posted on Feb 26, 2010

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Mar 21, 2010 | Heating & Cooling

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I have a Honeywell Chemotherm III. The thermostat


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or put it on frost setting if you can take head off spray with a little wd40 around needle and put head back on with head at max then turn down to frost or 0

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