Service manual

Si06-305 Problem Symptoms and Measures
Service Diagnosis 71
2. Problem Symptoms and Measures
Problem Symptom Check Item Details of Measure Reference
Page
None of the Units
Operates.
Check the power supply. Check to make sure that the rated voltage is
supplied.
—
Check the type of the indoor units. Check to make sure that the indoor unit type is
compatible with the outdoor unit.
—
Check the outdoor air temperature. Heating operation cannot be used when the
outdoor air temperature is 30°C or higher (only
for heat pump model), and cooling operation
cannot be used when the outdoor air
temperature is below –10 °C.
—
Diagnosis with code indication on
the remote controller
— 73
Check the remote controller
addresses.
Check to make sure that address settings for
the remote controller and indoor unit are
correct.
—
Operation Sometimes
Stops.
Check the power supply. A power failure of 2 to 10 cycles can stop air
conditioner operation. (Operation lamp OFF)
—
Check the outdoor air temperature. Heating operation cannot be used when the
outdoor air temperature is 30°C or higher (only
for heat pump model), and cooling operation
cannot be used when the outdoor air
temperature is below –10°C.
—
Diagnosis with code indication on
the remote controller
— 73
Some indoor units do not
operate.
Check the type of the indoor units. Check to make sure that the indoor unit type is
compatible with the outdoor unit.
—
Diagnosis with code indication on
the remote controller
— 73
Equipment operates but
does not cool, or does not
heat (only for heat pump
model).
Check for thermistor detection
errors.
Check to make sure that the main unit’s
thermistor has not dismounted from the pipe
holder.
—
Diagnosis with code indication on
the remote controller
— 73
Diagnosis by service port pressure
and operating current
Check for insufficient gas. 99
Large Operating Noise and
Vibrations
Check the power transistor. ——
Check the installation condition. Check to make sure that the required spaces
for installation (specified in the Installation
Manual, etc.) are provided.
—