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Carrier 2-stage heat pump installed in 1995. Unit was working fine when I lowered thermostat setting (78 to 65 degrees)prior to going out of town last week. Now digital thermostat (NO BATTERY) is dark and heat pump is inop.

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By dark do you mean off? if so check your breakers

Posted on Oct 30, 2008

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Carrier OEM to Honeywell Programmable Tstat - NEED HELP


you likely have a "two stage" system, but not a two stage heat pump. the first stage is probably the heat pump itself, and the second stage is the auxilliary resistance heat that suppliments the heat pump at lower temps. if i knew the terminals that are available on the new stat, i could advise you on the proper wiring.

Jan 27, 2013 | Carrier Air Conditioners

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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

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The heat pump stays on to 20 deg (outdoors) and the burners will not work till the temp is under that leaving the house at a max 65 deg, I beleave the heat pump should true off around 30 -35 deg ? then the...


Remove the cover of the circuit board and controls on the outside unit. Some units have a thermostat that allows you to set the temperature at which it switches to the second stage of heat. Set that for about 34 degrees.

Jan 02, 2011 | Air Conditioners

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We have bought a home with the wite rodgers thermostat 1f85-275 it doesn't seem to be working. on the top right of the screen it states 1&2 stages? anyway, help would be appriciated


Hi, this thermostat is for central heat and air systems that have more then 1 stage of heating or cooling. For example, your unit may have 2 stages of cooling, as in 2 compressors, or 1 stage of cooling and 2 stages of heating as used in commercial heat pumps. This is a multi-stage heat pump thermostat. It may be just a matter of programming the stat. If you can find a manual on it, this would help. If you open the cover, it should have directions on how to program it.Make sure you have power to everything, check all breakers to see if they may be shut of, even if you have a display, doesn't mean you have high voltage to run the unit. Make sure fan is in auto, and on heat or cool, and temperature set for it to come on. Please keep me posted.
Sincerely,
Shastalaker7
A/C, Heating Contractor
PS Your unit has 1 stage of cooling, and 2 stages of heating.

Nov 05, 2010 | Air Conditioners

1 Answer

Instead of the heating element turning on the heat pump runs out side thermostate is not set on eheat


The heatpump is your 1st. stage heat, when you have a call for heat it will bring on the outdoor unit.
When the first stage heat can't heat the house and the indoor temperature drops 2° or 3° then 2nd. stage heat will kick in and maintain the house temperature at about 2° or 3° below the temperature setting.
If you outdoor unit fails or goes into defrost then emergency heat will kick in and keep the house at 2nd stage temperature approximately 2° or 3° below thermostat setting.
If you have an outdoor thermostat or balance point setting on outdoor board, it will shut the outdoor unit off at a certain set outdoor temperature and the 2nd stage heat will be primary heat for the house.

Jan 05, 2010 | Air Conditioners

1 Answer

My problem is in addition to moisture near some duct outlets the thermostat always go 2 degrees below the set limit .I also have a carrier infinity system installed only 1 yr, had the problem from the...


if you have a mercury thermostat and it is not leveled properly it will turn the temperatyure on and off by a couple of degrees
some thermostats have the capability of running the unit longer than the set temperature
i would recommend calling a local heating and air conditioning contractor and get the unit cleaned and bring up the issue then

Aug 04, 2009 | Air Conditioners

1 Answer

Carrier thermostat reading stuck on 50 but doesn't work


If it is Carrier tstat. Some have resets other dont. Kill power to insid unit. WAit five minutes turn back on. If it has batteries take them out. But the storm may have damaged the tstat. I had a thunderstorm damage 11 tstats in one building. You can buy a tsta at Home depot that will work and they are easy to wire. Just make sure you get the coorect tstat. If the unit is straight cool electric thats the easy one. A heat pump you need a Tsta with two stage heat one stage cool. You can pick one up for about 25 to 30 dollars. Please call back for more help be glad to assist.Rusty

Jun 13, 2009 | Air Conditioners

1 Answer

Thermostat setting


what i would do is see if the outside unit is working at all. when you first turn it on the air was warm due to the fact that the temperature inside was cooler than the set point. when it get within 2 degrees the unit shuts off the backup heat and your running on the hp alone. with both stages at the same temp you are running the hp and the electric heater and that can become very expensive. What I would do is make sure that the filters were clean and look at the outside unit and see if it has a red reset button on it, if it does reset it and see if the unit runs. If it doesn't then you need to call a quallified service person out to take care of the problem.

Dec 16, 2008 | Weather King 12AJA6001AH Air Conditioner

1 Answer

Temperature varies 13 degrees around setpoint on aux heat


I don't have the book for this particular unit but, check the sequencers that control the electric heat mode, as the regulator heat pump works good. The part may have a time or temperature delay that is too long for you. Also if it has a remote thermostat, check the heat anticipate setting. You will have to check the installation manuel, but its usually .6 to .8, but I don't think that is the problem.

Nov 28, 2007 | GE Zoneline AZ55H09D Air Conditioner

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