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E2 fault code on AUX heatpump model # ASWH18b4, unit still operates, but fault code stays on..what does this mean.unit has recently been installed.

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  • marcus_carte Aug 23, 2010

    Thanks for that, you mentioned external safty sensor, located on units ductwork in the attic, I do not have ductwork , I have no attic,,this is a back to back installation. Is the E2 fault caused by low voltage to unit. the unit still operates , but the temp. indicators come on for a moment then it displays E2..any further ideas..Thanks

  • marcus_carte Aug 24, 2010

    I have a AUX brand split unit model # ASWH18B4
    that the fault code E2 displays were temp display should be, when unit is turned on the temp display work for moment then E2 displays unit is working, is the voltage incorrect or something else besides theromstat sensor etc.

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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

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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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