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MAINTENANCE
1 Testing Board Introduction
1.1 Compose of Testing Board
The testing board is in front of electrical box and can be observed well. It has several following advantages:
detect indoor unit numbers and indoor unit address, displays real running function and error code automatically. It
is composed of the function section, data section and button section.
1.2 Instruction of Function and Data Section
Running state The display of function section The display of data section
Stop
① The section will display the numbers of the indoor
units which have established communication with the
outdoor unit. For example, if there are seven established
indoor units, the section will display “7”.
② It will display the address of the indoor units by
turns. For example, the “1b” is represented of the indoor
unit 1B.(BU module:1/2/3，Indoor unit: A/b/C/d/E)
① If the function section displays the
numbers of the indoor units, the data
section will display the outside
temperature. For example, the “35” is
represented of 35℃.
② If the function section displays the
address of the indoor unit，the data section
will display the model of the indoor unit,
for example, the “35” is represented of 35
model.
Normal
The code of running state:
Code
Running
state
Code Running state
UE
Pressure
equalization
UH Heating
UP Pump down F7 Oil returning
UC Cooling H1 Defrosting
It displays the target gear of the
compressor. If the gear is zero, it will
display “0”. For example, the gear is the
fifteenth; it will display “15”. The range of
the gear is from 0 to 60.
Malfunction
If the malfunction occurs in the system, the section
will display the error code. If there are several
malfunctions, it will display the error codes by turns at
intervals of 2 seconds.
① If the malfunction occurs in the
outdoor unit, the section displays nothing;
② If the malfunction occurs in the indoor
units, the section displays the address of
the indoor unit.
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