To Next Page

To Previous Page

10-2. Troubleshooting Using the Self-Diagnostic Monitor

10-2-1. Method of Self-Diagnosis

If the operation lamp of the indoor unit flashes every half-second, carry out

detailed troubleshooting using the following method.

●

If the operation lamp flashes every half-second as soon as the power is

plugged in, there is either a faulty external ROM (for OTP data) on the

board of the indoor unit, an insertion fault, or the ROM is not installed.

●

Even when power is not being supplied, the malfunction mode will remain

in memory, so carry out the diagnosis as follows:

Procedure

(1) Restore power.

(2) Set the operation selector of the indoor unit to OFF (Self-Diagnosis).

(3) If an abnormality is sensed or an automatic protective action is taken, the self-diagnostic lamps No. 1, 2 and 3

respectively alternately blink on for 5 seconds and off for 2 seconds (the buzzer sounds when they go off).

When there is no abnormality detected, there will be no indication on self-diagnostic lamps No. 1, 2

and 3, nor will the buzzer sound.

(4) The buzzer sounds three times to inform that the diagnosis has been completed.

(5) After the repair, always set the operation selector to DEMO and restore power to delete the contents of the

diagnosis. After that, set the operation selector to OFF to check that the contents were deleted.

10-2-2. Details of Diagnosis

NOTE

Operation selector

Normally set it to ON position.

OFF, TEST and DEMO positions

are used for inspections, etc.

TEST

OFF

DEMO

✕✕

People

Sensor

Timer Operation

Details of Diagnosis Details of Abnormality

Room temperature sensor abnormality

Indoor heat exchanger temperature sensor

abnormality

Compressor temperature sensor abnormality

SH sensor abnormality

Outdoor heat exchanger temperature sensor

abnormality

Narrow tube A, B sensor abnormality

Ambient temperature sensor abnormality

Wide tube A, B sensor abnormality

CT (electric current) abnormality

Serial fault, erroneous inter-unit wiring

connection

HIC / power transistor protection

(electric current / temperature)

●

Indication on Indoor Unit

✕ …Off …Flashing ●…Illuminated