Whether Ps
is greater than 0.9Mpa during running
(10 minutes after start)
81
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
[AE] protection action of exhaust temperature at low freguency
Whether the gas
pipe, liquid pipe and shutoff valve of
outdoor unit are all open
Fully open shutoff valve
Whether
outdoor PMV is normal
1.Connection of the connectors; 2.Wiring;
3.Winding; 4.Valve body;
5.Outdoor PCB
Repair outdoor PMV
Whether the
resistance value/temperature characteristic
of TD1 sensor is normal
Replace TD1 sensor
Whether the wiring is correct
Wiring as per regulation
(Check the function and conduct confirmationthrough outdoor unit mismatching line)
(Confirm whether there is block, broken refrigerant pipe. Judgewhether the refrigerant is required to add as per the injection rateof the refrigerant)
Insufficient refrigerant, block,refrigerant pipe is bent
[b4] Low pressure sensor (Ps) circuit
Whether the
connection and wiring of the connectors
of CN08 (low pressure sensor)
are normal
Repair the connection and wiring ofthe connectors
Whether the
characteristic of low pressure sensor is
normal
Replace low pressure sensor
The refrigerant passes through thesuction by-pass from exhaust caused bythe fault of the compressor or improperreversal of the four-way valve. Checkand replace the compressor and four-way valve
Check outdoor I/F PCB, if improper,replace it
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