16 May 69

Symptom: DXF-19, DXH-19, MGC-19 – ERROR CODE E4/E5/F1/F2/F3

Solution: MULTIPLE SOLUTIONS

Cause: OPEN CIRCUIT OR SHORT CIRCUIT OF TEMPERATURE SENSOR

Remarks:

DESCRIPTION:

IF THE SAMPLING VOLTAGE IS LOWER THAN 0.06V OR HIGHER THAN 4.94V, THE LED WILL DISPLAY THE FAILURE.

REPAIR:

1) CHECK THE CONNECTION BETWEEN TEMPERATURE SENSOR AND PCB:

IS IT PROPERLY WIRED?

NO = ENSURE PROPER CONNECTIONS
YES = CHECK 2)

2) MEASURE THE RESISTANCE VALUE OF THE SENSOR:

IS IT WITHIN ACCEPTABLE PARAMETERS?

NO = REPLACE THE SENSOR
YES = CHECK 3)

3) REPLACE INDOOR OR OUTDOOR PCB: