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When enable the maintenance mode, press “M” button, will display the PCB version information, press
“ ” button, will display the wire controller version information. After 3 seconds, back to the data query
interface.
When turn OFF the heat pump, enable the maintenance mode
：
Press “ ” button for 5 seconds, restore factory defaults, and exit the maintenance mode.
Press “ ” button for 5 seconds, enter into or exit refrigerant recovery mode, under this mode, “ ” symbol
will flash, in the meantime, compressor, 4 way valve, evaporator, high speed fan motor, circulation and
by-pass valve all work, press any button or after 20 minutes, will exit refrigerant recovery mode.
Note: When power on after 5 minutes, can not restore factory defaults, and also can not enter into
refrigerant recovery mode.
Lock and Unlock
When the controller is in the normal display state, the button is locked when there is no button operation
for more than 60 seconds, press the any button to unlock.
8.2.3 Error code
Error Code
Description
E01
Phase fault, power cable connection is wrong
E02
Lack of phase
E03
Water flow switch fault
E05
High pressure switch 1 fault
E06
Low pressure switch 1 fault
E07
High pressure switch 2 fault
E08
Low pressure switch 2 fault
E09
Communication Fault
E10
Reserved
E11
Time-limited protection
E12
High exhaust temp. protection 1
E13
High exhaust temp. protection 2
E15
Water tank/water inlet temp. sensor fault
E16
Outdoor coil temp. sensor 1 fault
E17
Outdoor coil temp. sensor 2 fault
E18
Exhaust temp. sensor 1 fault
E19
Exhaust temp. sensor 2 fault
E20
Indoor temp. sensor fault
E21
Ambient temp. sensor fault
E22
Water return temp. sensor fault
E23
Cooling water temp. too low protection
E25
Water level switch fault
E27
Water outlet temp. sensor 1 fault
E29
Suction temp. sensor 1 fault
E30
Suction temp. sensor 2 fault
