Kaisai KOU-12HDN1 Service Manual page 125

MLCAC-UTSM-2010-10
13. P6 malfunction (For single phase units)
P6 display
Module protection
Check whether the voltage range of P-N on
IPM module is normal? DC277-356V for
18K/24K/30KBtu/h; DC277-410V for
36K/48KBtu/h
Yes
Check whether the connecting line
between main board and the IPM
module is connected tightly
Yes
Check whether the connecting
line of the compressor is
connected correctly or tightly
Yes
Replace the IPM module, check
whether the system can work
normally?
No
Replace the main board, check
whether the system can work
normally?
No
Replace the compressor, check
whether the system can work
normally?
Outdoor Units
No
Check whether the input power supply
No
Connect it tightly,
check ok or not?
No
No
Connect it well,
check ok or not?
No
Check whether the single-phase bridge is
normal? Use the multimeter to measure the
resistance between each two terminals, check
whether there is the condition that value of
Yes
Trouble is solved
Yes
Trouble is solved
Yes
Trouble is solved
is correct? 220-240V, 1N, 50Hz
Yes
Check whether the power
supply line is connected
correctly and tightly
Yes
Check whether the lines in
E-part box are connected tightly
Yes
resistance is 0
No
Check whether the connecting line
of every reactor is normal? If the
line is broken, the resistance of the
two ports is ∞
Yes
Check whether the fuse on
the power board is normal?
Yes
Replace the power board
Troubleshooting
Regulate it to correct,
then check whether the
No
system can work
normally?
No
No
Connect it correctly and
tightly, check ok or not?
No
No
Connect it tightly,
check ok or not?
No
Yes
Replace the
single-phase bridge
No
Replace the
connecting line
Replace with
No
the same model
fuse
121