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Analysis or handling of some of the malfunction displays:
1.
System high pressure protection (E1):
Handling method: check the system pressure, or replace the PCB.
2.
Anti-freezing protection (E2):
The unit will recover later, no correction is needed.
3.
Compressor discharge protection (E4):
Possible reasons: shortage of refrigerant; blockage of air filter; poor ventilation or air flow short pass for
condenser; the system has non-condensing gas (such as air, water etc.); blockage of capillary assay
(including filter); leakage inside four-way valve causes incorrect operation; malfunction of compressor;
malfunction of protection relay; malfunction of discharge sensor; outdoor temperature too high.
Handling method: refer to the malfunction analysis in the above section.
4.
Low voltage over-current protection (E5):
Possible reason: Sudden drop of supply voltage.
5.
Communication malfunction (E6):
Handling method: Check if communication signal cable is connected reliably.
6.
Sensor open or short circuit (F1, F2, F3, F4, F5):
Handling method: Check whether sensor is normal, connected with the corresponding position on the
controller and if damage of lead wire is found
7.
Compressor overload protection (H3):
Possible reasons: insufficient or too much refrigerant; blockage of capillary and increase of suction temp.;
improper running of compressor, burning in or stuck of bearing, damage of discharge valve; malfunction of
protector.
Handling method: adjust refrigerant amount; replace the capillary; replace the compressor; use universal
meter to check if the contactor of compressor is fine when it is not overheated, if not replace the protector.
8.
System malfunction (H4):
i.e. overload protection. When tube temperature (Check the temperature of outdoor heat exchanger when
cooling and check the temperature of indoor heat exchanger when heating) is too high, protection will be
activated.
Possible reasons: Outdoor temperature is too high when cooling; insufficient outdoor air circulation;
refrigerant flow malfunction. Please refer to the malfunction analysis in the previous section for handling
method.
9.
No feedback from indoor fan motor
Possible reasons: the connection of indoor fan moor to the main board, or the motor, or PCB is broken.
Handling method: reinsert the motor's wire to PCB, or replace the motor, or replace PCB.
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