Maintenance; Error Code - mundoclima MUCO-H6T Service Manual

Service Manual

9. Maintenance

9.1 Error Code

Malfunction
No.
Name
High pressure
1
protection
Low pressure
2 protection of
compressor
High discharge
temperature
3
protection of
compressor
Display
Method
of Indoor
A/C Status
Unit
Nixie
tube
display
During cooling and drying
operation, except IDU
fan motor operates, all
loads stop operation.
E1 During heating operation,
the complete unit stops
and operation of remote
controller or buttons is
unavailable.
E3 The complete unit stops.
During cooling and drying
operation, compressor and
ODU fan motor stop while
E4
IDU fan motor operates.
During heating operation,
all loads stop.
Possible Causes
1. The mainboard and the display board
are not connected well;
2. The OVC terminal on mainboard is not
connected well with the high pressure
switch on the complete unit;
3. The wiring terminal between high
pressure switch and maiboard is loosened
or the high pressure switch is broken;
4. Refrigerant is superabundant;
5. Poor heat exchange (including blocked
heat exchanger and bad radiating
environment );
6. Ambient temperature is too high; (if it is
3-phase unit, the high pressure protection
may be caused by overcurrent protection
due to this reason);
7. The supply voltage is abnormal (if it is
3-phase unit, the high pressure protection
may be caused by overcurrent protection
due to this reason);
8. The air intake and air discharge at
indoor / outdoor heat exchanger are not
smooth;
9. Filter and heat exchange fins of indoor/
outdoor units are blocked;
10. The pipeline is blocked;
11. The gas valve and liquid valve for
outdoor unit are not completely opened;
12. The OVC input is at high level.
1.The mainboard and display board are
not connected well;
2. The LPP terminal on the mainboard is
not connected well with the high pressure
switch;
3. The wiring of high pressure switch
is loosened or high pressure switch is
damaged.
4. The refrigerant is insufficient;
5. The LPP input is at high level.
1. The system is abnormal. (e.g.:
blockage, etc)
2. Abnormal rotation speed of outdoor
motor (cooling );
3. Abnormal outdoor air intake (cooling);
4. System is normal, but the compressor
discharge temperature sensor is broken
or poorly contacted (Please check it
by referring to the resistance table for
temperature sensor).
44
Maintenance measures
Refer to Malfunction
Detection Flowchart
Refer to Malfunction
Detection Flowchart
Refer to Malfunction
Detection Flowchart