Question about Mitsubishi MS17TN Air Conditioner

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A/c shuts down after about 30 seconds

This is a Mitsubishi mini-split heat pump. Today it was 62dgrees inside this room, 65 degrees outside. When in cooling set at 59 degrees the heatpump would operate for about 30 seconds and shut down. When in heat it would operate normally without shuting off. In cooling the suction pressure was about 50psi. The smaller line is also not insulated . The suction line is coming back cold. Is ther a problem or is the cooler temps causing this by a sensor or something. I saw no low or high pressure switches. Thanks Bill Pugh

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Sounds to me either a low refrigerant charge or low air volume over the evap coil (inside). There is a sencer for temps outside maybe it's tripping out on that.

Posted on Nov 10, 2008

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