197
TROUBLESHOOTING
For diagnosis and repair, Refer to P306 and after, [Wiring Diagram of the Outdoor Unit]
Engine speed
does not
increase
During avoidance
control, etc.
Refrigerant high pressure avoidance control
Refer to P188, 8)High Pressure Ab-
normality in Heating Operation
The unit is under control to avoid excessive
increase in discharge temperature
Refer to P190, 10)Overheated Refrig-
erant Discharge Temperature in Cool-
ing Operation
The unit is under control to avoid excessive
increase in engine coolant temperature
Refer to P186, 4)Engine Coolant Tem-
perature Abnormality
Sensor/Harness
system failure
High pressure sensor malfunction (Sensor judges
the high pressure higher than the actual value, and
the engine speed does not increase.)
Refer to P223, 39)Inspect Refrigerant
High Pressure Sensor
Engine failure Inadequate engine output.
Refer to P185, 3)Engine Starts But
Stalls
Improper
installation
Pressure loss in
piping is large
Piping length between indoor and outdoor units is
too long
Actual length is within 541 ft (165 m)
Equivalent length is within 623 ft (190 m)
Within 197 ft (60 m) from the first branching
Between indoor - outdoor units
Outdoor unit is higher: Within 164 ft (50 m)
Outdoor unit is lower: Within 131 ft (40 m)
Permissible height difference between
indoor units : Within 49 ft (15 m)
There are too many bends in piping
Piping after branching is too long
Pipe size is improper
Height difference in piping is too large
Branching failure
in piping
Mounting angle / position of the branching pipe is
incorrect
Another branch is made after a branch header
Indoor unit
selection error
The total capacity of connected indoor units is too
large
Within 130 %
(The capacity exceeding the rating
makes performance go down)
Problem Possible Cause Specific Example Inspection and Treatment
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