lennox ms7 single zone mini split heat pump error code

by Mike
(charlton ma 01507)

The unit will turn on and run in heat mode for awhile, then it stops and the heat symbol flashes and the temperature changes to an error code HI. What does that mean

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Dec 14, 2015
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starstarstarstarstar 		Error code HI
by: Chris

Just called Lennox support because I had same error, they looked up the code and said that the unit is going into defrost mode. Just let it cycle and it will continue back to heat mode, at least that is what mine does.
Jan 13, 2014
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starstarstarstarstar 		Reset the heat pump
by: Anonymous

Lennox has a number of error codes that can populate on the temperature digits. Sometimes the codes can be temporary problems so you need to reset the unit. You can does this by turning the unit off, then on again. If the code is still present, disconnect power completely from the unit by flipping the disconnect switch or circuit breaker. If the code returns after doing this, then it is a problem that needs to be fixed. Maybe a Lennox contractor can comment on the meaning of this code.

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