Error code

Mitsubishi Electric PU code P1

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Meaning

mistor (TH1) The unit is in three-minute resume pre1 vention mode if short/open of thermistor is detected. Abnormal if the unit dose not reset normally after three minutes. (The unit returns to normal operation, if it has normally reset.) Constantly detected during Cooling, dry2 ing, and heating operation. Short: 90: or more Open: -40: or less

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Possible causes

(1) Defective thermistor characteristics (2) Contact failure of connector (CN20) on the indoor controller board. (Insert failure) (3) Breaking of wire or contact failure of thermistor wiring (4) Defective indoor controller board

Solution

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