MAXA BDLM26A2 - 8. Troubleshooting; 8.1. Indoor Unit Malfunctions

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8. Troubleshooting
8.1. Malfunction Display of Indoor Unit
a) Malfunction display requirement
When there are several malfunctions, they will be displayed circularly.
b) Malfunction display method
(1) Hardware malfunction: immediate display; refer to “malfunction display table”;
(2) Operation state: immediate display; refer to “malfunction display table”;
(3) Other malfunctions: it is displayed after the compressor stops for 200s; refer to “malfunction display table”. Note: when
the compressor is restarted, the malfunction display delay time (200s) is cleared.
(4) When the unit is under limit frequency or frequency drop state, the display can be controlled via remote controller.
c) Malfunction display control
The indicator lamp and dual 8 nixie tube displays shall be synchronized. That is when the indicator lamp blinks, the dual 8
nixie tube displays the corresponding malfunction code.
d) Display control via remote controller
Enter display control: press light button successively for 6 times within 3s to display the corresponding malfunction code;
Exit display control: pressing light button successively for 6 times within 3s or after display is shown for 5min, the display
will terminate.
Indoor Unit Indicating Lamps
Malfunction name
"88" Display
RUN " "
COOL " "
HEAT " "
Zero detection circuit error
U8
Flash 17 times
Jumper terminal error protection
C5
Flash 15 times
No feedback of indoor fan motor
H6
Flash 11 times
Short/open circuit of the indoor ambient temp. sensor
F1
/ Flash once
Short/open circuit of the indoor evaporator
F2
/ Flash twice
Inlet tube sensor malfunction
b5
Flash 19 times
Outlet tube sensor malfunction
b7
Flash 22 times
Short/open circuit of the of the IPM module temp. sensor
P7
Flash 18 times
Short/open circuit of the outdoor ambient temp. sensor
F3
Flash 3 times
Short / open circuit of the temperature sensor at the inlet of
the condenser coil.
A5
Short/open circuit of the outdoor tube sensor.
F4
Flash 4 times
Short/open circuit of the temperature sensor at the outlet of
the condenser coil
A7
Exhaust sensor open or short circuit
F5
Flash 5 times
Communication error between the indoor and outdoor units
E6
Flash 6 times
Compressor phase current error
U1
Flash 12 times
Compressor demagnetization protection
HE
Flash 14 times
PN voltage drop protection (DC link voltage drop error)
U3
Flash 20 times
IPM high temperature protection
P8
Flash 19 times
Refrigerant-lacking or blockage protection
F0
Flash 10 times
Capacitor charge error
PU
Flash 17 times
Refrigerant system high pressure protection
E1
Flash once
Refrigerant system low pressure protection (reserved)
E3
Flash 3 times
Compressor thermal overload protection
H3
Flash 3 times
Fault in matching
LP
Flash 19 times
Loading EEPROM error
EE
Flash 15 times
AC current detect circuit error
U5
Flash 13 times
Outdoor DC fan motor malfunction
L3
Mode conflict
E7
Flash 7 times
Refrigerant recovery mode
Fo
Quick flash Quick flash
Blow mode
ON for 0,5s and
OFF for 10s
Defrosting or oil return in heating
ON for 0,5s and
OFF for 10s
Compressor start-up failure
Lc
Flash 11 times
Compressor discharge high temperature protection
E4
Flash 4 times /
Anti-high temperature protection
E8
Flash 8 times
AC over-current protection
E5
Flash 5 times
Overload protection
P5
Flash 15 times
Compressor desynchronizing
H7
Flash 7 times
Compressor phase failure / phase-inverse protection
Ld
Flash 11 times
IPM module protection
H5
Flash 5 times