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Thread: Mitsubishi Mini Split

  1. #1
    Join Date
    Dec 2018
    Location
    WV
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    3

    Default Mitsubishi Mini Split

    I have a Mitsubishi Mini Split system. A 3-ton heat pump and 4 indoor air handlers. The system was installed (self) and assisted by a qualified tech for some aspects. The system is in a new construction addition and has not been used for a couple years. After initiating the install the units were checked to make sure they were operational in the air conditioning mode and all worked as intended. Now that I am continuing the construction project and winter has arrived I needed heat in the areas. To my surprise they would not heat. The remotes are initiating the air handlers and louvers are operating but after a few minutes the operational display light begins flashing. It will not start up the heat process. The breaker and disconnect is allowing power to the unit and the wiring is correct. Is there a reset for the outside unit? I have called the serv tech that finished the installation and have been unable to contact him. Any suggestions? I am a DIY (advanced for a lack of terms) and did the majority of the install which was double checked by the "tech" and approved.

  2. #2
    Join Date
    Feb 2012
    Location
    Kent, WA
    Posts
    248

    Default

    Do you have a diagnostic manual (that shows either trouble codes or explains blinking light sequences)?
    Is the reversing valve working so it is in heat mode and not cooling?
    Can you measure the pressures, or won't it run long enough?
    Do they have an Emergency Heat setting and does that work?

    I don't know anything about these, I'm just putting some general things out there to think about.
    Mark
    Kent, WA

  3. #3
    Join Date
    Dec 2018
    Location
    WV
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    3

    Default

    Quote Originally Posted by suemarkp View Post
    Do you have a diagnostic manual (that shows either trouble codes or explains blinking light sequences)?
    No I have no manuel

    Is the reversing valve working so it is in heat mode and not cooling?
    Have no idea but that would seem to be a possible problem.

    Can you measure the pressures, or won't it run long enough?
    Have no way to measure the pressure or knowledge . It will not run at all in the heat mode.

    Do they have an Emergency Heat setting and does that work?
    Yes it does have an emergency mode. But from what I understand that is just a temporary and the electric consumed is a lot greater

    I don't know anything about these, I'm just putting some general things out there to think about.
    Thanks for your reply. I could try the Emergency Mode if anyone thought it may be benifical.

  4. #4
    Join Date
    Feb 2012
    Location
    Kent, WA
    Posts
    248

    Default

    Emergency mode would just verify that it is somewhat wired properly. It tends to be strip heat which is like using a resistance space heater (more expensive).

    How did you install this if you have no gauges? Did the other guy buy the refrigerant and charge the system? If so, you're going to need a person like that unless the problem is electrical/controls.
    Mark
    Kent, WA

  5. #5
    Join Date
    Dec 2018
    Location
    WV
    Posts
    3

    Default

    Quote Originally Posted by suemarkp View Post
    Emergency mode would just verify that it is somewhat wired properly. It tends to be strip heat which is like using a resistance space heater (more expensive).

    How did you install this if you have no gauges? I actually installed all the components and had a certified HVAC tech to purge the lines and pump the Freon and hook up the electrical.


    Did the other guy buy the refrigerant and charge the system? The Freon was contained within the unit and was charged by him.


    If so, you're going to need a person like that unless the problem is electrical/controls. Yes I know but I have been unable to contact him.

    Thanks, I will let you know once I get it straightened out

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