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Digital thermostat CM907 switches heating on the wrong way round, i.e. on when it is too warm and off when it is too cold

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1.check indoor wiring.
2 check thermostate.
3 check remote.

Posted on Apr 05, 2008

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The blower starts before its warm and it blows cold air for about 30 sec when its shutting down .


When any unit 1st come's on, you'll always have some cold air that's in the ducts that will blow out before you get warm air. If your duct work is uninsulated in a cold basement or crawl space then it will be even more noticeable. When the unit is heating from the Heat Pump mode, it takes a little longer for the gases to get warm enough so you'll fell heat. When it gets cold enough for the unit to switch from heat pump to the gas or electric heat source, you'll get warm air faster. If you have gas heat, some Thermostats have an anticipator setting for the gas valve. If it's set wrong it will effect the on/off cycle of the gas valve.
All duct work in non heated and a/c spaces, including inside walls,above dropped ceilings, in attics and crawl spaces, must be sealed & taped at the seams and joints and then insulated and taped.
Most new construction has solved that problem with insulated duct board, flexible insulated supply's and special tape.

Dec 12, 2013 | Rheem 13PJL30A01-RHLLHM3617JA 2.5 Ton 14...

1 Answer

We have a new a/c and the system has heat strips. For a/c. we have had the thermostat set on AC at 72degrees. Now that it is getting colder and may need some heat in the house, do we switch the...


If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
The emergency heat setting should never be used unless your outside unit is not functioning.
The emergency heat setting overides the heat pump (the outside unit will not be energized).
The emergency heat setting will run the auxillary heat (heat strips) only.
When the thermostat is set in the heat position the heat pump will run to heat your house.
If the heat pump can't keep up (extreme cold) then then the auxillary heat will kick in to augment the heat pump until it satisfies the thermostat settings. If your room temperature gets 2 degrees below your thermostat setpoint, your auxillary heat will kick on. Example, say you are going to be gone a couple of days and you turn your heat down to 60 degrees. When you return and it is 60 degrees in your house, you turn the thermostat up to 70 degrees. Since you are turning the temperature up 2 degrees or more (10 degrees in this case) from the 60 degree room temperature then the heat pump will come on and the auxillary heat strips. The unit will continue heating like this until the temperature in the house gets to 69 degrees and the heat strips will turn off and the heat pump will continue to run until the 70 degree setpoint is reached.
Hope this helps.
SeagullAC

Sep 15, 2011 | Air Conditioners

2 Answers

I had the aircon thermostat on cold then my friend just transfered it to warm without turning the aircon off because it was too cold. in the afternoon when i tried to use the aircon theremostat to...


Problem is the thermostat.The heat/cool selector switch might not be making try back and fourth from heat/cool to make a good contact.In heat mode make sure the temp is set LOWER than your cooling temp.If it is too cold in the future just RAISE the cooling temp up and not the heat/cool switch.

Jun 04, 2011 | Air Conditioners

1 Answer

Furnance not heating


Make sure that the thermostat is set for the proper medium that you are using being gas or electric. Inside the cover of the thermostat should be a setting for either eletrical heat or gas heat. Set this switch for what your system is G for gas or E for eletric. This may solve your problem. Good Luck hope this helped you some

Dave

Oct 26, 2009 | Intertherm P3RA-036K Air Conditioner

2 Answers

AC unit outside blowing out cold air, vents


Sounds like compressor not running. may be a bad capacitor, could also be low on freon.

Aug 30, 2009 | Goodman CLJ30AR32 Air Conditioner

1 Answer

Duo Therm Thermostat anticipator adjustment


replace your thermostat with a cheap digital heat/cool thermostat - no more problem. (be sure to turn off the power to all parts of the HVAC system before changing the thermostat.)

May 28, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Consolidated Industries gas furnace,


The digital thermostat must be programmed for GAS heat.
If the problem occured before the t-stat change and is still happening, the problem would be with ignition within the furnace.

Mar 14, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Continues to run


yes I would switch it over due to the fact that the balance point reached. Since I'm not there to look at the system monitor the actual temperature inside and if you cannot maintain the setpoint on the thermostat you may have to bring it back on. I've seen recently that there was not enough backup heat to keep the house warm enough during cold spells. Stay warm.

Dec 22, 2008 | Ruud Central System Air Conditioner

1 Answer

Heater doesn't work


How old, at a guess, would the thermostat be?

This will help in figuring out what might be wrong.

Dec 23, 2007 | Ruud Handler Air Conditioner

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