Haier AU96NFTAHA Service Manual page 82

[A6] Protection action of exhaust temperature sensor (TD1)
Whether the
gas pipe, liquid pipe and shutoff valve
of outdoor unit are all open
Yes
Whether
outdoor PMV is normal
1.Connection of the connectors;
2.Wiring; 3.Winding; 4.Valve body;
5.Outdoor PCB
Yes
Whether the
resistance value/temperature characteristic of
TD1 sensor is normal
Yes
Whether the wiring is correct
Yes
Insufficient refrigerant, block,
refrigerant pipe is bent
[A7] Protection action of suction temperature (Ts)
Whether the
gas pipe, liquid pipe and shutoff valve
of outdoor unit are all open
Yes
Whether
outdoor PMV is normal
1.Connection of the connectors;
2.Wiring; 3.Winding; 4.Valve body;
5.Outdoor PCB
Yes
Whether the
resistance value/temperature characteristic
of Ts sensor is normal
Yes
Whether the
refrigerant passes through the by-pass from
exhaust to suction of the
four-way valve
No
Insufficient refrigerant, block,
refrigerant pipe is bent
No
No
No
No
(Check the function and conductconfirmation through outdoor unitmismatching line)
(Confirm whether there are block, broken refrigerant pipe. Judge whether
the refrigerant is required to add as per the injection rate of the refrigerant)
No
No
No
Yes
(Confirm whether there are block, broken refrigerant pipe.
Judge whether the refrigerant is required to add as per the
injection rate of the refrigerant)
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Fully open shutoff valve
Repair outdoor PMV
Replace TD1 sensor
Wiring as per regulation
Fully open shutoff valve
Repair PMV
Replace Ts sensor
Check and replace the winding and
main body of the four-way valve