Question about GE Zoneline AZ55H09D Air Conditioner

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Temperature varies 13 degrees around setpoint on aux heat

When outside temperature drops to the point where the auxillary heating elements come on, the temperature in the room will vary 13 degrees. Foe example, with the thermostat set for 70 degrees, the temperature in the room will vary from 66 degrees to 79 degrees. This is unacceptable for comfort. I had a GE technician come out last December to service the unit and he replaced a number of parts, but the problem still exists.

The problem is only this severe when the unit is on auxillary heat. Even on normal heat pump heating, the temperature variation is about 5 or 6 degrees.

This Zoneline replaced an 8 year old Zoneline AZ51H09DBC the performed just perfect....temperature on all seasons and operating mode controlled temperature within about 2 or 3 degrees.

Since my previous Zoneline worked fine in this room, does anyone have any ideas why this new unit has such a large hysteresis in controlling the temperature around the set point?

Any help will be appreciated. I very disappointed in the unit and in GE's inability to fix it.

Thanks,
Ron

Posted by on

  • Ron9825 Dec 05, 2007

    Thanks for your thoughts, I really appreciate it. No, not using a remote thermostat, just the built in digital one.



    A GE tech is scheduled to come again tomorrow. Hopefully this will be a more experienced person than the one that came last December, and who can help,



    The unit was new just 2 years ago (Dec 2005) and replaced an 8 year old zoneline that worked flawless for 8 years.



    When the current unit was originally installed the outside temperature was mild and the aux (electric elements) did not turn on. Before the weather got cold enough to use aux heat we left for Florida for the winter. It wasn't until last December (2006) that the weather was cold enough to require the aux heat. That's when we first were aware of the 12 to 13 degree variation in room temp.



    A GE technician came about this time (Dec 2006) last year and replaced a few parts. (He was frustrated and not familiar with the zoneline and cut wires and spliced components etc) He was a butcher and used a shotgun approach to troubleshooting. However, the weather was again too mild to require the aux heat, so we had no way of knowing if it was fixed or not. We again went to Florida for the winter, and did not know till last week that the problem still was not fixed.



    Hopefully GE has kept a record of my complaints and will still fix the unit in warranty, since I reported the problem before the 1 year warranty expired, and it has not been fixed.



    Sorry to get so wordy, if that's a word, but that's how this stand.



    Thanks again for the help. I'll you know if this thing gets fixed.



    Kind Regards,

    Ron in Cincinnati

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I don't have the book for this particular unit but, check the sequencers that control the electric heat mode, as the regulator heat pump works good. The part may have a time or temperature delay that is too long for you. Also if it has a remote thermostat, check the heat anticipate setting. You will have to check the installation manuel, but its usually .6 to .8, but I don't think that is the problem.

Posted on Dec 04, 2007

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