Question about Heating & Cooling
E2 - error simply thermistor short circuit.
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 Aug 23, 2010
I read on one web blog that the E2 code was a low voltage code. Not sure what the unit considers low voltage, but line voltages can swing greatly during the day, depending on community usage. If the unit still operates fine, I would measure the line voltage, and call customer support to see what they have to say about the problem.
It's possible that the unit has a bad voltage sensor, also. As long as the unit operates ok, I wouldn't think this would be a problem.
Good luck, thanks for using FixYa, and hope this helps.
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
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