Mitsubishi Alarm Code #331 cause 5

Alarm Code #331

Model CPE52, 53, 14, 15, 15V, 16

Failure Low refrigerant pressure sensor ( LPT ) failure

Countermeasure

<< Cause -(5) >>

Air differential pressure transducer ( APT ) failure ( Optional item )

< Check > ( Refer to Page F-27 )

• Select “ DISPLAY ” on the test mode and turn off all contactor relays to put to the

state of all loads off.

Check if the APT pressure value displayed on the personal computer, the LED or the LCD indicates

more than approx. 50Pa ( abnormal ).

• Compare the sensor DC output voltage between 1(GRN) and 2(WH) of CN32

and the above APT pressure value.

< Relation between the output voltage and the pressure >

Sensor DC output voltage (V) = { 0.008158 × Pressure (Pa) + 1 } ± 0.08

< Action >

Out of Allowable Range : Replace APT.

(Note) To cancel the error display only, turn OFF the dip switch SW1 - 8 as an emergency method.

Dhilreefer