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I have a RV Comfort PHP Coleman Mach Thermostat that fails to register correct temperature so does not start or shutdown systems when the actual temperature changes.

Ok, in the morning when I set temp for A/C to come on at say 75 degrees and the thermostat is showing a correct room temp of 70 degrees the room temp reading does not change as actual temp increases. So A/C never comes on. And it fails to turn on heat as well. Because room temp reading never changes.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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koolbreezes
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SOURCE: coleman mach air

Time for a spring cleanning,, especially the drainnage system, filter,, front cooling coils-and the drain line! thank you-very-much!

Posted on Aug 28, 2008

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tborn6
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SOURCE: Furnace doesn't reach desired temperature

On the thermostat if its a manual on then pop the cover off and look for a small dial with numbers on it. Take and move it tpoi a higher number than whats it is set at. Its called a heat anticipater and is supppose to make it so that the unit does not oveshoot or under shoot like what your experiencing. If its a digital oine then you are going to have to configure the setting in the insdtallers menu.

Posted on Dec 21, 2008

  • 1 Answer

SOURCE: coleman tsr mach 3 RV Air Conditioner

the fan motor bearings need lub....the shaft has a tiny access hole to put some oil into. because the fan shaft is slowing down, it is putting more strain on the voltage current, and eventually the internal breaker shuts down the ac........plus your condenser is not getting enough air accross it, compressor heats up, and it too will shut the unit down......older units have to be oiled every year, and eventually it too will fail, and a new blower motor assembly is needed or replace the ac unit.....blower motor units are around $130....now you install it or pay to have it done at around another $150 labor,,,,,try yourself, if it fails then call the tech........let me know ..ray..yyzazz@ao.com

Posted on Dec 31, 2008

tborn6
  • 700 Answers

SOURCE: Honeywell T87f 3855 Doesn't Activate Heater

thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

Posted on Jan 25, 2009

  • 61 Answers

SOURCE: thermostat issue with comfort zone II.

Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

Posted on Feb 19, 2009

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