Troubleshooting Si12-411A
192 Service Diagnosis
5.18 CT or Related Abnormality
Remote
Controller
Display
H8
Outdoor Unit LED
Display
A
5
1
4
2
4
3
1
4
1
Method of
Malfunction
Detection
A CT or related error is detected by checking the compressor running frequency and CT-
detected input current.
Malfunction
Decision
Conditions
The compressor running frequency is below 55 Hz and the CT input is below 0.1 V.
(The input current is also below 1.25 A.)
If this error repeats 4 times, the system will be shut down.
The error counter will reset itself if this or any other error does not occur during the following
60-minute compressor running time (total time).
Supposed
Causes
Power transistor defective
Internal wiring broken or in poor contact
Reactor defective
Outdoor unit PCB defective
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