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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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2 Answers

In the cooling mode for zone 1, why won't the temperature stay as set on the cool setting?


If it 2 degree cooler then that's fine .adjust your thermostat 2 degrees higher so you will get the temperature

Feb 16, 2018 | Carrier Heating & Cooling

1 Answer

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 Heating & Cooling

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 | Heating & Cooling

1 Answer

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 | Heating & Cooling

1 Answer

I am installing a Honeywell T841 onto existing RGYW wiring. The fan kicks on, but I notice the air conditioner is not running. Were one or more of these supposed to go on the W2 or B terminals? Thanks!


Need to have more numbers in model number to be sure There's about 30 T841 t'stats and some are1, 2, and 3 stage heat pump and some 1, 2, and 3stage AC.
If you have
R to transformer
G to fan relay
Y to contactor in outdoor unit
W to Gas valve
You have the thermostat wired right.
Depending on the T'stat B could be the common side of the transformer or 2nd stage heat.
W2 terminal are for 2nd stage heat
You need to put the thermostat on cool and lower the setting to bring on the cooling. Then go outside and see if you have power to the outdoor unit and 24 volts to the contactor coil.

Sep 06, 2009 | Honeywell Electronic Programmable...

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 | Heating & Cooling

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 | Heating & Cooling

1 Answer

Heat pump auxiliary heat does not turn on


Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.

Nov 25, 2008 | Honeywell TH4210D1005 Heater

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