Ontario lockout of 2 ton geo, sight glass question

Discussion in 'Maintenance and Troubleshooting' started by Maurice Sabourin, Jan 24, 2016.

  1. Maurice Sabourin

    Maurice Sabourin Newbie but learning quicly...

    Hi everyone.
    I have a 2 ton closed loop geo, the goes into lock out mode

    in the last few days the ton as been locking out leaving only the aux heat running.
    the manual say a the led blinking once means high pressure or lock out.

    I have changes the air filter. to make sure that was not it, but the other one was not that dirty...

    one thing I have noticed is the sight glass it is labeled, caution (purple), wet (orange), dry (blue).
    it seem to me the the "flow" stops while the compressor is running. so much that I cant tell if its dry.

    I had a technician in yesterday, he could not understand why the unit was locking out.

    Current outside temp: -7C, wind chill -11C

    please see my signature for info on the whole system... let me know if I should add more details...

    Thank you
  2. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    Many things, need more info.

    EWT and Flow needs to be checked, then the antifreeze level.

    Lack of antifreeze can stop the flow due to the coil freezing, which will cause a high pressure lockout.
  3. engineer

    engineer Well-Known Member Industry Professional Forum Leader

    High pressure arising from a water coil freeze-up in heating mode...doesn't a cold coil reduces low side pressure?
  4. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    Meant to say FP1, not high pressure.
    Last edited: Jan 25, 2016
  5. geoxne

    geoxne Active Member Forum Leader

    It's all in the manual here-

    High Pressure faults in heating are most commonly caused by inadequate or no airflow.
    1-Check airflow and fan operation
    2-Check for faulty HP switch
    3-Check control board for HP circuit operation
    4-Only if NOT 1 through 3- Check refrigeration circuit for overcharge, blockage or stuck txv

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