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Serial Communication error

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oliverl114
oliverl114 Member Posts: 2
in A-C, Heat Pumps & Refrigeration
What causes a serial communication error?

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  • oliverl114
    oliverl114 Member Posts: 2
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    This is a Fujitsu mini split
  • Jamie Hall
    Jamie Hall Member Posts: 23,466
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    Bad connections (plugs and jacks and intermediate connectors, if any). Bad power to either the receiving or transmitting module. Bad grounds for either one. Faulty cable. As a last resort, bad modules. In that order.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    WMno57
  • 109A_5
    109A_5 Member Posts: 1,387
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    Hello @oliverl114,

    All the things @Jamie Hall stated, check the easy and obvious first. Another more illusive issue that can cause problems (but much more rare) is environmental electrical interference from a some other electrical device.

    Also with some equipment the L1 and L2 have to be the same (connected through the building wiring) at all the devices. Since the communication uses them or just one of them.


    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

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