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Thermostat is flashing E2. Thermostat screen was blank until I put batteries in it. Unit will not turn on.

Thermostat is flashing E2 code. Goes to a Carrier heat pump model FA4BNF024. Unit will not turn on.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: My Heat will not work

the e2 code on a carrier comfort zone thermostat is indicitive of the external safety sensors which are located on your units ductwork in the attic. the e2 code are the hpt/ and lat sensor codes. the hpt is the heat pump temperature sensor and the lat is the leaving air temperature sensor. you can pull off the cover of the panel and behind it will actually give you all the fault codes associated with you carrier tsat.each sensor has a certain ohm rating and if its out of the range it will fail. now as to the reasons for failure, the indoor coil could be dirty, filters dirty, refrigerant charge incorrect.

Posted on Dec 22, 2008

vanni7
  • 163 Answers

SOURCE: 3 amp fuse blows on a carrier 58mcb furnace board

Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Posted on Jan 04, 2009

  • 306 Answers

SOURCE: How to test for 24 vac between R and C

Yes you are right the control voltage of your furnace is 24 volts. Really without a load on the transformer usually runs 28 volts then you put a load on it and it drops down to 24-26 volts. Check the voltage between the R terminal and the W terminal with the selector switch in heat mode. Or move the thermostat switch to heat. R to C would do it also. You could also do the voltage check right at the transformer one side of the transformer is 120 volts and the other side is 24. Look for the black and white wires that is the 120 volt side the blue and yellow or off colors is the secondary side.

Now if it checks low say 24 or 22 your gas valve needs min. 24 volts to hold open the valve that allows the gas to flow into the burners. So if one of the symptoms is related to burners come on for about 3 to 5 min. then shut down and the fan keeps going it is loosing the necessary voltage to hold open the gas valve.

One more thing make sure the air filter is clean as this will cause the heat to build up in the heat exchanger and hit the high limit safety device and cut the gas off. Until the air cools enough to allow the high limit to reset then the gas valve will open and start the process all over again. Dirty A-Coil will do the same thing as the air goes through the coil to get to house. let me know how it goes ken

Posted on Jan 18, 2009

mastatech
  • 478 Answers

SOURCE: Heat pump cycling on and off.

It sounds as if you you have a low charge of refrigerant, r22. When the unit comes on outside, the outdoor coils become the lowside, there is a low pressure switch that is tripping out contactor protecting the compressor.

Posted on Mar 11, 2009

  • 38 Answers

SOURCE: Carrier Comfort Zone 2 flashing E2

the e2 error on your thermostat is a problem with the return temp sensor on your system, the only thing you can really do is call a company and replace it, you can't bypass it or remove it cause the system wont run properly

Posted on Jun 30, 2009

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