Operation Manual

23
Malfunctioning of the unit and error codes
When an error occurs or the protection mode is set automatically, the circuit board and the wired
controller will both display the error message.
Protection/
Malfunction
Error
code
LED
indicator
Possible reasons Corrective actions
Standby Dark
Normal
running
Bright
Lower tank
water temp.
sensor failure
PP1
☆●
(1flash 1
dark)
1) The sensor open
circuit
2) The sensor short
circuit
1) Check the sensor
connection
2) Replace the sensor
Upper tank
water temp.
sensor failure
PP2
☆☆
●
(2 flashes 1
dark)
1) The sensor open
circuit
2) The sensor short
circuit
1) Check the sensor
connection
2) Replace the sensor
Evaporator
coil temp.
sensor failure
PP3
☆☆☆●
(3 flashes 1
dark)
1) The sensor open
circuit
2) The sensor short
circuit
1) Check the sensor
connection
2) Replace the sensor
Return air
temp sensor
failure
PP4
☆☆☆☆
●
(4 flashes 1
dark)
1) The sensor open
circuit
2) The sensor short
circuit
1) Check the sensor
connection
2) Replace the sensor
Ambient
temp. sensor
failure
PP5 ☆☆☆☆☆
●
(5 flashes 1
dark)
1) The sensor open
circuit
2) The sensor short
circuit
1) Check the sensor
connection
2) Replace the sensor
High
pressure
protection
(HP Switch)
EE1
☆☆☆☆☆
☆
●
(6 flashes 1
dark)
1) Too high air inlet
temp
2) Less water in the
tank
3) The electronic
expansion valve
assembly blocked
4) Too much refrigerant
5) The switch
damaged
6) The uncompressed
gas is in refrigerant
system
1) Check if the air inlet temp
is over the working limited
2) Check if the tank is full of
water. If not, charge water
3) Replace the electronic
expansion valve assembly
4) Discharge some
refrigerant
5) Replace a new switch
6) Discharge and then
recharge the refrigerant