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MAINTENANCE
1 Testing Board Introduction
The testing board is in the front of electrical box and can be observed well. It has several following
advantages:
Automatically detect indoor unit numbers
Automatically assign indoor unit addresses
Automatically display real running function and error code
Option settings to suit the demand of the customer
1.1 Compose of Testing Board
The testing board 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）
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
capacity of the indoor unit, for example, the
“35” is represented of 3500W.
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.
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