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Community and Q&A

Multi-head minisplit heat control

Fred Dobson | Posted in General Questions on

Installed a 2-head Mitsubishi Mr. Slim 30K heat pump. Is there a way to control the temperature of each unit? One head is installed upstairs and the other head downstairs. The downstairs unit is always overheating.

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  1. Jin Kazama | | #1

    I don't understand what you are asking ..

    You have installed 2 seperate heads ?
    They should've come with independant remote control nah ?

  2. Fred Dobson | | #2

    Yes they came with a separate remote control for each head. The downstairs unit overshoots its setting by several degrees. Can this be corrected. Thanks.

  3. GBA Editor
    Martin Holladay | | #3

    I would contact the manufacturer for advice. In the meantime, just set the downstairs unit at a lower temperature.

  4. Jin Kazama | | #4

    Fred: ok

    yes contact your installer or Mitsubishi ... might only be a defect temp sensor on the head unit

    They should operate to their target temperatures independently

    good luck :)

  5. Expert Member
    Dana Dorsett | | #5

    The temperature sensing in mini-split heads aren't exactly precision instruments, and are affected by how open the air flow is around where the head is mounted, since they can only sense the temperature of the incoming air, which can be a few degrees different from the room average.

    Bump it to where it's delivering the comfort level you like, and just leave it there. It may drift a small amount with big changes in weather and may need tweaking, but in general it'll track the load with very stable room temperatures.

    If it's NOT tracking decently there could be an issue with the sensors & controls in the ductless head, or the head is so sub-optimally placed that it can't really function well.

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