Panasonic CS-VZ9SKE Service Manual page 134

17.4.33 F99 (DC Peak Operation Error)
Troubleshooting
After the air conditioner starts operation, does the compressor
rotate for a while before it stops?
The compressor
does not rotate Is the fan rotating normally?
(Cooling: Outdoor unit side; Heating: Indoor unit side)
at all
Check for dirt and interrupted heat radiation on the heat
exchanger.
(Cooling: Outdoor unit side; Heating: Indoor unit side)
For heating operation only
Check if the 2- and 3-way valves are open.
Check for voltage drop on outdoor unit during operation.
(Between the outdoor unit terminals block 1 and 2)
Step: 1 Check the voltage during operation.
Check the gas pressure during the rated operation.
Perform operation while the lead wires (red, blue & yellow)
connected to the compressor are removed, and then check
the error code.
Diagnosis Procedures and Cause
No abnormality is observed
No abnormality is observed
Yes
2 Check the voltage within 2 min after the operation
is stopped.
3 It is normal if voltage drop during operation is 10V
or below.
Normal
Normal
Lower than the normal value
Check for presence of gas leak.
There is a gas leak
An error other than F99 occurred
The compressor rotates
for a while
An abnormality
is observed
An abnormality
is observed
No
(Improper work)
Abnormal
Higher than the
normal value
There is no
gas leak
F99 occurred
134
Measures to be Taken
Inspect the fan or control board.
Fix the problem.
Open the 2- and 3-way valves.
(Replace the compressor.)
Fix the wire connecting the indoor and
outdoor units; or fix the wiring between
the electrical outlet and circuit breaker.
Replace the compressor.
Replace the capillary tube or expansion
valve.
Replace the part from which gas is
leaking.
Replace the outdoor unit control board.
If the error is not solved by replacement of
the control board, it is a compressor failure.
Replace the compressor.