Having problems with your Air Conditioners ?

Carrier heat pump (basic model) runs at 0 or below

\015 My new Carrier heat pump (basic model) continues to run the compressor even down below zero. Shouldn't this shut off and go into back up heat? Should I shut it off manually and am I just wasting energy? Thank you.\015

Answers :

A basic model heat pump with an air handler with electric strip heat generally will continue to run with a call for heat regardless of the outdoor air temperature unless there was an outdoor thermostat (an accessory) installed. There is still heat in the outdoor even at temperatures of zero and below. Generally, there is a balance point of approx 30-35degF that allows the heat pump to heat your house to 68degF without the need for the electric heaters. Below that, the heat pump can still extract heat from outside and "pump" it into your house; however, it will need help from the electric heaters. In temperatures below the balance point, the heat pump will run non-stop. As the temperature in the house falls approx 1 - 2 degF below the setpoint, the electric heaters will energize. So it is not uncommon for the system to run non-stop with the temperature falling a few degrees below setpoint. The colder the outside temperature, the more often the strip heaters will cycle on/off. If your system is well-maintained and operating at proper performance, it is still cheaper to run your heat pump than it is to run on straight electric heat. If you live in a climate where below zero temperatures are normal during the winter months, you might want to research heat pump options that offer higher COP's and increased performance in colder temperature than the basic contractor's model. Start with initiating communication with a local contractor. You will need to consider initial cost and the pay-back period based on your local energy costs and your specific demands you want your system to meet.
\015\012Hope this helps!

Repair Help & Product Troubleshooting for Air Conditioners
You need a second opinion or clarification ? ask it in the comment box OR you can Ask Your Own Question

Tips for a great answer:

  • Please provide as much detail as possible as this will allow our members to better understand and respond to your Comment
  • If you need clarification, ask it in the comment box
  • It's 100% free, no registration required

Suggested Questions/Answers :

It is recommended you read all this kind of situations

Carrier heat pump (basic model) runs at 0 or below

A basic model heat pump with an air handler with electric strip heat generally will continue to run with a call for heat regardless of the outdoor air temperature unless there was an outdoor thermostat (an accessory) installed. There is still heat in ... Carrier 38CKC036 Air Conditioner

Hi, I have a 1.5 carrier mini split heat pump. I cant find the model number but believe it was made 2000-2003. This has the remote with the infra red eye mounted in the front of the main unit (like a tv). (There is no other controller as I have seen with other units). The unit is heating and cooling fine, however, it does not seem to be sensing the thermostat. Whether it be in heat or cold, it will turn on and run for about 10 minutes and then shut off and not come again. To get it to run again,

Hi,There are a few things that can cause that kind of problem....The unit could be low on charge and the thermistor on the indoor unit will sense the coil getting too cold and shut it down on a hard lockout....resetting the power resets t ... Carrier 38CKC042 Air Conditioner

Carrier 38YXA036320 My Carrier Model 38YXA036320 Heat Pump will not run. Fan and compressor will not start in heat or cool modes. When I select cool, I can stand next to the unit and I hear things being energized but nothing happens except a humming sound.

... Air Conditioners

I have a Kewanee model#1736 hot water boiler furnance which is gas fired.I had to change the heat pump and the heat pump switch.The heat system is wired through a Webster Heating Contol unit which has three settings,Run,Auto,and Off.Normally when the heat control unit is in the Auto position the furnace and heat pump will start and run automatically until it reaches the desired thermostat temp. Then both the pump and the furnace would shut down at the same time until the thermostat falls below t

The thermostat turns the Boiler and the Heat Pump on simultaneously???....That doesn't sound right...normally the Thermostat brings on the heat pump first and if the temp continues to fall (Its Cold out) then the Boiler would kick in about 2 degrees ... Air Conditioners

I Have A carrier Model #38YCB048300 heat pump/a/c unit which is only used for a/c, The Pump is not coming on with the inside main fan.I have basic knowledge with a/c I have been in auto repair for 30 years, any hep would be appreciated Thanks Barry

... Carrier Air Conditioners

Goodman heat pump model CPKJ421B. Tripped breaker for outside unit two weeks ago. Reset breaker, tripped again today. Unit won't run now. Did some basic checks and found that the 28 vac from the inside unit was not going through the low pressure switch to pull in the 220 vac contacter for the compressor. Possibly either the refrigerant is low or the low pressure switch is bad. Could a faulty switch, maybe losing and regaining contact quickly, trip the breaker? Could the refrigerant, just before

... Goodman Air Conditioners

I have a Lennox model CB19-51-1P air handling unit with HP19-511-1P compressor heat pump unit. I just turned the heat on for the first time this season. And I am getting low heat volume. The heat pump unit is running for long periods. I am getting enough heat to maintain the 70 degrees setting with constant cycles, shutting off for short periods, running long periods. When the thermostat is turned to a cooler temperature, the unit shuts off as it should. Could you please help trouble shoot po

First thing you need to check is if the reversing valve is working you maybe running your A/C with the heat strips on depends on the t-stat your using some heat pumps will bring the strips on with a high d ... Air Conditioners

I have a Carrier Weathermaker Infinity furnace model 58MVP100-F-1-20 with 3 zones and Carrier Comfort Zone II programable thermostat. I recently installed ageothermal heat pump system which includes a hot water coil in the furnace plennum. The heat pump is sized to meet loads except for the coldest days of winter - (below 0 F) - when the gas furnace is expected to kick in. My problem appears to be the Weathermaker's characteristics don't accommodate the low heat /slow response provided by

Http://www.hvac-talk.com/vbb/archive/index.php?t-85094.html here is a site i found very useful ... Carrier Air Conditioners

Carrier Heat Pump Model 38EYG042300 airhandler blower operational, T-stat set to emergency heat still operational and does not blow the 5 amp fuse . When T-stat is set to Cooling or Heat from the Heat pump after about 3-5 minutes the 5 amp fuse continually blows, checked the transformer both primary and secondary checks out good, check transformer to ground not grounded, is it posibble for the T-stat to ground out and blow the 5 amp fuse when calling for the heat pump to heat or cool? Hard for m

Hello,\015\012Compressor contactor coil or reversing valve coil... they may not have a direct short but still may pull high amps and blow the fuse... have you had a brown out or power outage lately? They will fry coils...\015\012From what ... Air Conditioners

Carrier thermostat Hello, My Carrier electronic thermostat is connected to a heat pump.  It was set to the COOL position during a summer thunderstorm when the AC suddenly began running no matter what the SET temperature was.  It works normally when I change it to the AUTO position.  The HEAT and EHEAT positions work normally. I tried cutting power to the unit for 2 days, after which it worked normally even on COOL, but after a short power failure it resumed the problem of running the AC continuo

I hate to say it but Ive had trouble with Carrier's Tstats doing similar improper things. Unfortunatly the only repair is going to be replacement of the whole tstat. I recommend Honeywell's FocusPRO or VisionPRO tstat. Ive yet to have one fail and th ... Air Conditioners

My 8 yr old Amana heat pump, model RHE48A2D with Honeywell progammable thermostat in heat mode has the blower running constantly. When there is a 6 to 8 degree differnce between room temp and thermostat setting compressor runs as it should, the closer it gets to thermostat setting, it will run about 30 seconds, blower continues to run until getting just cool air, about 5 minutes, compressor kicks back on for 30 sec., continues to do this, thermostat shows it has reached set temperature,

Hi, It sounds to me like what you are describing is, that when it is 6 to 8 or so degree difference then the stat says, unit operates as it is supposed to but then before it satisfies the t-stat, it shuts the compressor down long enough to start cool ... Air Conditioners

I have a carrier heat pump that will run for about 5 minutes before tripping a breaker and then displaying an E2 code on the thermostat. It will run fine on auxillary heat but not in heat or cool mode without tripping breaker and displaying E2 code.

Sounds like something is going on with the compressor or the outdoor unit. Call a service company ... Carrier TSTATHCP Programmable Thermostat Air Conditioner

Bryant air conditioner - outside unit will not run - before it quit running, air temperature in house rose from 65 degrees to 75 degrees. Inside fan continued to blow - air smelled like a car air conditioner that ran out of Freon. Bought Freon - need to know where to add it. The heat pump model # BF-163S bi directional but also coming from unit is another line that runs same direction with same type of valves. Air conditioner model # 697CN030 - B

... Air Conditioners

Rudd upmc024jaz I have Ruud heat pump model UPMC 024JAZ, the air condition works great but the heat pump comes on runs for a minute or so and the compressor goes off. you hear a hissing sound from the compressor like pressure being released.

... Air Conditioners

The Aprilaire humidifier (model 600) attached to Amana heat pump (model RHE36c2c) has never run. Installer says the humidifier only activates when emergency heat is activated. Humidity is 30% and I want 40 to 50%. Can this be corrected?

... Amana PTH123B25AJ Heat Pump Air Conditioner

We just purchased a brand new Goodman 4 ton 15seer heat pump, model #AEPF4260TX5N4472#-- with a Honeywell thermostat controller,model#0836. The installer is having trouble with the fan not cutting off when it meets the set thermostat temperature. The fan keeps running, even if you unplug the green wire from the thermostat, or if you totally unplug the thermostat, the fan still runs. I am thinking that he has one of the wires wrong. HELP!

If you turn the power off and then back on does the fan stay running then. It is possible that the wiring is incorrect but it could also be a faulty fan relay or limit. If you disconnect the power when it is running and then turn it back on and the f ... Air Conditioners

Carrier heat pump model number fb4anf030

... Air Conditioners

KW capacity on model # FE402, Carrier furnace and heat pump 25HNB6

... Air Conditioners

I have a new home that is near to completion. Two heat pumps (zoned) are installed and both are now running - house is completely closed and is comfortably warm. Only the downstairs pump is being used at the present. The upstairs thermostat is turned off. The downstairs pump cycles every 26 seconds, that is, on for 26 and off for 26. This never changes. The ext temp is about 56 and the thermostat is set to 68. The pumps are both contractor grade Carrier 13SEER, 2 ton units, and the total

Its not normal.It indicates problem with the thermostat.The thermostat is just not accurate enough, and is likely falling below the set-point and causing the system to run the minimum 26 seconds when the\015\012 timer expires. This ... Air Conditioners

I have a Tempstar model NFCP3600A1 (style # FCP3600A) ICP Heat Pump. Starting last week, the unit kept heating well over the set temperature. I swapped out the thermostat thinking it went bad, but it still continued heating and the "off" wouldn't work at the new thermostat either. Next, I checked for shorts in the thermostat wires and they seemed OK. I then replaced the TI 26FC-2 circuit board. Once the unit heated the house to the set temp, it continued running up to 75 degrees. "Off" and lowe

... Air Conditioners

We had a new Carrier Weathermaker Infinity Gas Furnace installed in our home on 9-21-99.The Carrier people said the furnace was in good condition this past October.But prior to that as of April 2010 the furnace started sending up really cool air. Was told by the Carrier serviceman that the Controlboard was running on high and low at the same time also found the Board fired.Then NO HEAT. Got a new Controlboard installed,that didn't work Still NO HEAT.Was told furnace needs a model Plug that was

... Air Conditioners

I have a dometic heat pump a/c basement park model unit. The fan is not working. The compressor runs, but no air inside or out. I have power into the run cap. but not on the brown wire to the fan from the run cap. I also have no power to the fan high or low off of the relay board. Where do I go next to isolate?

... Dometic Air Conditioners

Have Coleman-Evcon heat pump system. Model DRHS0421CB. Condensing unit has intermittent no run condition. I replaced the contactor, as it was a few years old. I eliminated the thermostat from the equation by twisting together the RYO wires at the thermostat sub panel. This makes the air handler run and MOST of the time also makes the condensing unit come on as well. When it does run together, it cools great. Suction and discharge pressures are normal. The float switch is ok and no water prese

Elimate the items not needed to test the unit.\015\012Disconnect the defrost power board and set air handler to run.\015\012Disconnect the thermostat and hold contactor switch in closeing connections to the compressor and condensor fan. ... Air Conditioners


... Carrier FB4ANF060 HVAC Electric Unit & AC Condenser

I have a carrier heat pump model FK4DNF003. The dehumidify function is not working. It is set for 65, but it is over 70 and very humid with mold developing in the apartment. The heat and cool functions otherwise work. Please help.

... Air Conditioners

A detailed question is important to get you a relevant answers

  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
all rights reserved to the respective owners || ad-trader.net || Terms of Use || Contact || Privacy Policy
Load time: 0.1025 seconds