20 Nov 76

Symptom: DXF-19, DXH-19, MGC-19 – ERROR CODE P6

Solution: MULTIPLE SOLUTIONS

Cause: LOW PRESSURE PROTECTION

Remarks:

DESCRIPTION:

WHEN THE SYSTEM PRESSURE REACHES A CERTAIN VALUE, THE LOW PRESSURE PROTECTOR WILL SWITCH OFF. AFTER THE PRESSURE RESUMES BACK TO NORMAL, THE PROTECTION CODE WILL DISAPPEAR.

***REPAIR (ONLY FOR 36K MODELS):***

1) CHECK THE WIRING BETWEEN THE LOW PRESSURE PROTECTOR AND MAIN CONTROL BOARD:

IS THE WIRING CONNECTED PROPERLY?

NO = CONNECT IT WELL
YES = CHECK 2)

2) CHECK IF LOW PRESSURE PROTECTOR IS BROKEN (HOW? –> DISCONNECT THE PLUG. MEASURE THE RESISTANCE OF THE LOW PRESSURE PROTECTOR. IF THE PROTECTOR IS NORMAL, THE VALUE SHOULD BE 0:

IS THE VALUE OF THE LOW PRESSURE PROTECTOR 0?

NO = REPLACE THE LOW PRESSURE PROTECTOR
YES = CHECK 3)

3) CHECK THE OUTDOOR AMBIENT TEMPERATURE:

IS THE OUTDOOR AMBIENT TEMPERATURE TOO LOW?

YES = STOP THE UNIT
NO = CHECK 4)

4) CHECK THE VALVE CORE OF HIGH PRESSURE VALVE:

IS THE VALVE CORE OF THE HIGH PRESSURE VALVE OPENED?

NO = OPEN THE VALVE CORE OF HIGH PRESSURE VALVE COMPLETELY
YES = CHECK 5)

5) CHECK THE INDOOR FAN:

IS THE INDOOR FAN RUNNING PROPERLY IN COOLING MODE?

NO = PLEASE CHECK THE SOLUTION FOR THE FAN SPEED MALFUNCTION (ERROR CODE E3)
YES = CHECK 6)

6) REPLACE THE OUTDOOR MAIN BOARD. ALSO CHECK IF THE REFRIGERANT SYSTEM IS OK. IF THE REFRIGERANT IS NOT OK, REPLENISHMENT OF REFRIGERANT MAY BE NECESSARY