HTW -AT-V100MR290A Manuel De L'utilisateur Et D'installation page 93

C Evaporator coil temp.
D Return gas temp.
E Ambient temp.
Electronic expansion valve
F
Temp of solar thermal
H
collector
L
DC fan speed
Malfunctioning of the unit and error codes
When an error occurs or the protection mode is triggered, the circuit board and the wired
controller will both display the error message.
Protection/
Malfunction
Standby
Normal running
Lower part tank
water temp.
sensor failure
Upper part tank
water temp.
sensor failure
Evaporator coil
temp. sensor
failure
Return air temp
sensor failure
Ambient temp.
sensor failure
Solar collector
temp. sensor
failure
Electronic anode
output open or
short circuit
Electronic anode
output voltage
exceeds normal
working range
DC fan failure
step
Error
Possible reasons
code
1) The sensor open circuit
P1 2) The sensor short circuit
3)PCB board failure
1) The sensor open circuit
P2 2) The sensor short circuit
3) PCB board failure
1) The sensor open circuit
2) The sensor short circuit
P3
3) PCB board failure
1) The sensor open circuit
P4 2) The sensor short circuit
3) PCB board failure
1) The sensor open circuit
P5 2) The sensor short circuit
3) PCB board failure
1) The sensor open circuit
P6 2) The sensor short circuit
3) PCB board failure
1）Lack of tank water
2）Circuit of electronic anode
P7
is open or short
3）PCB board failure
1）The water quality is
abnormal
2）Lack of tank water
P8
3）Circuit of electronic anode
is open or short
4）PCB board failure
1) Connecting wire off
P9 2) DC fan failure
3) PCB board failure
-9 ~ Actual testing value. Error code P3 will
99°C be shown in case of a malfunction
-9 ~ Actual testing value. Error code P4 will
99°C be shown in case of a malfunction
-9 ~ Actual testing value. Error code P5 will
99°C be shown in case of a malfunction
10 ~ 47
step
Measured value，if failure，show P6
0-140 ℃
0-140 ºC
N*10，if failure，shows P9
1) Check the sensor connection
1) Check the sensor connection
1) Check the sensor connection
1) Check the sensor connection
1) Check the sensor connection
1) Check the sensor connection
2）Connect the circuit well or
replace an electronic anode
1）Install water purifying plant
to improve the water quality
3）Connect the circuit well or
replace an electronic anode
1) 4）Replace a PCB board
3）Change the PCB board
39
N*10 step
Corrective actions
2) Replace the sensor
3) Change the PCB board
2) Replace the sensor
3) Change the PCB board
2) Replace the sensor
3) change the PCB board
2) Replace the sensor
3) Change the PCB board
2) Replace the sensor
3) change the PCB board
2) Replace the sensor
3) Change the PCB board
1）Fill the tank with water
3）Replace a PCB board
2）Fill the tank with water
1）Check the DC fan
connection
2）Replace the DC fan ；