Testo 550?
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Thread: Testo 550?

  1. #1
    Join Date
    Mar 2005
    Location
    NJ
    Posts
    99

    Testo 550?

    Was using 550's today reading SH/SC just fine all of sudden lose SH thought it may be batteries replaced them then lost SC/and SH.. all the arrows are doing now are making screen blink...Anyone else come across this?

  2. #2
    Join Date
    Feb 2011
    Location
    Florida
    Posts
    70
    Hello

    You may want to go to the Testo site for support to see if you need to download firmware or to reset it

    http://www.testo.com/online/abaxx-?$...oryid=49804543
    HVAC Tech of 33 years in the HVACR and Controls Industry

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