195
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 P187, 7)High Pressure Abnor-
mality in Cooling Operation
The unit is under control to avoid excessive
increase in discharge temperature
Refer to P190, 10)Overheated Refriger-
ant Discharge Temperature in Cooling
Operation
The unit is under control to avoid excessive
increase in engine coolant temperature
Refer to P186, 4)Engine Coolant Tem-
perature Abnormality
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
Pipe branch failure
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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