16 May 68

Symptom: DXF-19, DXH-19, MGC-19 – ERROR CODE E3/F5

Solution: MULTIPLE SOLUTIONS

Cause: FAN SPEED IS OPERATING OUTSIDE OF THE NORMAL RANGE

Remarks:

DESCRIPTION:

WHEN THE INDOOR FAN SPEED IS TOO LOW (300RPM) FOR A CERTAIN TIME, THE UNIT WILL STOP AND THE LED WILL DISPLAY THE FAILURE (E3). WHEN THE OUTDOOR FAN SPEED REGISTERS BELOW 150RPM OR OVER 1500RPM FOR AN EXTENDED PERIOD OF TIME, THE UNIT WILL STOP AND THE LED WILL DISPLAY THE FAILURE (F5).

REPAIR:

1) TURN POWER OFF, THEN RESTART THE UNIT AFTER 2 MINUTES:

DOES A PROBLEM REMAIN?

NO = THE UNIT IS OPERATING NORMALLY
YES = CHECK 2)

2) SHUT OFF THE POWER SUPPLY AND ROTATE THE FAN BY HAND:

DOES IT TURN EASILY?

NO = FIND THE CAUSE OF THE PROBLEM AND RESOLVE IT
YES = CHECK 3)

3) CHECK THE WIRING OF FAN MOTOR:

IS IT PROPERLY WIRED?

NO = ENSURE PROPER CONNECTIONS
YES = CHECK 4)

4) MEASURE THE VOLTAGE FOR THE FAN MOTOR FROM THE PCB:

IS IT WITHIN THE NORMAL PARAMETERS?

NO = REPLACE THE INDOOR/OUTDOOR PCB
YES = REPLACE THE FAN MOTOR –> IF NECESSARY, ALSO REPLACE THE INDOOR/OUTDOOR PCB