![background image](http://html.mh-extra.com/html/daikin/3mks50dvm/3mks50dvm_service-manual_501112235.webp)
Troubleshooting
Si12-619A
222
Service Diagnosis
5.10
Freeze-up Protection Control
Remote
Controller
Display
A5
Outdoor Unit LED
Display
A
5
1
4
2
1
3
4
4
4
Method of
Malfunction
Detection
Indoor unit icing, during cooling operation, is detected by checking the temperatures sensed by
the indoor unit heat exchanger thermistor and room temperature thermistor that are located in a
shut-down room.
Malfunction
Decision
Conditions
In the cooling mode, the following conditions (A) and (B) are kept together for 5 minutes.
(A) Indoor unit heat exchanger temperature
≤
–1°C
(B) Indoor unit heat exchanger temperature
≤
Room temperature –10°C
If the freeze-up protection control is activated 4 times continuously, the system will be shut
down.
(The 4-time counter will reset itself if any of the following errors does not occur for 60
minutes: OL, radiation fin temperature rise, gas shortage, and compressor startup.)
Supposed
Causes
Wrong wiring or piping
EV malfunctioning in each room
Short-circuit
Indoor unit heat exchanger thermistor defective
Room temperature thermistor defective
Summary of Contents for 3MKS50DVM
Page 13: ...Introduction Si12 619A xii ...
Page 131: ...Control Specification Si12 619A 118 Function and Control ...
Page 213: ...Instruction Si12 619A 200 Operation Manual ...
Page 283: ...Check Si12 619A 270 Service Diagnosis ...
Page 302: ...Si12 619A Outdoor Unit E Series 50 52 58 Class Removal Procedure 289 Step Procedure Points ...
Page 385: ...Wiring Diagrams Si12 619A 372 Appendix FTK X S50 60 71FVLT ...
Page 399: ...Si12 619A vi Index ...