Trouble shooting
Si04-115
74
Service Diagnosis
5.9
Operation Halt Due to Detection of CT Error
Remote
Controller
Display
H8
H8
H8
H8
Outdoor unit LED
Display
A
5
Method of
Malfunction
Detection
CT errors are detected using the compressor's operating frequency and the input current
detected by the CT.
Malfunction
Decision
Conditions
When the compressor's operating frequency is more than 62 Hz and the CT input is less than
0.1 V.
∗
Inlet current 0.75 A
"
When a CT error is generated 4 times, the system shuts down.
"
The malfunction counter will be reset unless the emergency stop will take place within sixty
minutes of the compressor operation time (as integrated time) after the return from the
malfunction (including the other emergency stops).
Supposed
Causes
"
Faulty power transistor
"
Breaking of wire or faulty connection of internal wiring
"
Faulty outdoor PCB (1).
Troubleshooting
Check No.3
Refer to P.85
Check No.11
Refer to P.90
Check No.3
Check capacitor voltage.
∗
Is
operation current on
power live like as
right figure?
NO
NO
NO
Is resistance value normal?
NO
Check rectifier input voltage
Is voltage
270±30 VDC?
Check No.11
Check rectifier.
Is voltage generated?
Does abnormality
display appear?
Operate unit.
Turn off power, and turn on again.
NO
YES
YES
YES
YES
YES
To section about thermistor
abnormalities
Replace outdoor unit PCB.
Replace outdoor unit PCB.
Replace rectifier (diode module).
Replace outdoor unit PCB.
Replace outdoor unit PCB.
2sec
Current
(Approx)
Capacitor will be charged
when MRM 10 is ON.
Current rize together
with frequency rize.
Time
(R1951)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
