Service manual

66 Service Manual SM-MDS_(i)
L2 Low pressure sensor
broken
• Low pressure sensor connecting wire broken
• Outdoor PCB LS port broken
74
L3 Indoor and outdoor
communication
• Outdoor work normal, but all indoor communication abnormal
76
10 System malfunction
(slave unit)
• Slave unit high pressure malfunction occurred 3 times
• Low pressure malfunction occurred 3 times
• Discharge temperature too high 1 times
• Compressor overload protector jumped for 3 times
80
11 TH1 open/short-circuit
(slave unit discharge)
• Slave unit discharge temperature sensor TH1 broken or loose
12 TH2 open/short-circuit
(slave unit 1# inlet coil)
• Slave unit 1# inlet coil temperature sensor TH2 broken or loose
13 TH3 open/short-circuit
(slave unit 1# midlet
coil)
• Slave unit 1# midlet coil temperature sensor TH3 broken or loose
14 TH4 open/short-circuit
(slave unit 2# inlet coil)
• Slave unit 2# inlet coil temperature sensor TH4 broken or loose
15 TH5 open/short-circuit
(slave unit 2# midlet
coil)
• Slave unit 2# midlet coil temperature sensor TH5 broken or loose
18 TH8 open/short-circuit
(slave unit ambient
temperature)
• Slave unit ambient temperature sensor TH8 broken or loose
19 TH9 open/short-circuit
(slave unit total outlet
coil)
• Slave unit outlet coil temperature sensor TH9 broken or loose
1A TH10 open/short-circuit
(slave unit sub-cooling
outlet)
• Slave unit sub-cooling outlet coil temperature sensor TH10 broken or loose
1B TH11 open/short-circuit
(slave unit super
cooling suction
temperature)
• Slave unit super-cooling suction temperature sensor TH11 broken or loose
1C TH12 open/short-circuit
(slave unit suction
temperature)
• Slave unit suction temperature sensor TH12 broken or loose
73
1F Emergency run
• Premise: part indoor communication failure
• Slave unit suction super-heat less than 1ºC for 15 minutes persistently.
• Slave unit TH12 malfunction
87
20 Outdoor storage
malfunction (slave unit)
• Slave unit PCB chip data read failure by outdoor unit when power on
• Slave unit PCB chip broken
82
6