Troubleshooting
SiBE04-101
102
Service Diagnosis
4.15
Interrupt Due to OL Action or Thermal Fuse Blow-Out
Remote Controller
Display
E5
Outdoor unit LED
Display
A
5
1
4
2
3
3
4
4
3
Method of
Malfunction
Detection
OL action detected by the opening of OL contact.
Thermal fuse blown out.
Malfunction
Decision
Conditions
If an OL action (opening) or thermal fuse blowout signal has come from the OL action or thermal fuse
detection circuit to the microcomputer.
OL action detected twice, resulting in a shutdown of the system.
(The dual-action counter will reset itself if any of the following troubles does not occur for a total one
operating hour of the compressor since the interruption: OL failure, radiation fin temperature rise, gas
shortage, or compressor failure to start.
OL setting : Open at 125±3˚C
Closed at 95±10˚C
Thermal fuse setting: 76˚C (not reusable once blown out)
Supposed Causes
OL action because of refrigerant shortage
OL action because of 4-way valve failure
Error detection due to an opening of OL contact
Error detection due to connector in poor contact
Error detection due to broken OL harness
Error detection due to outdoor-unit PC board failure
OL action because of mixture of tap water in the field
Temperature around the terminal block above 76˚C
Thermal fuse blown out due to harness in poor contact
SiBE04-101.book Page 102 Monday, October 15, 2001 3:08 PM
