ENGLISH-51
03 OTHERS
Troubleshooting
If the unit has some problem to work properly, the LED on hydro unit will ash and some error codes will be displayed on the
controller.
The following table described the explanation of error codes on the LCD display.
Thermistor
Check its resistance. 10kohm@25°C (Hydro unit), 200kohm@25°C (DHW Tank)
Check its location as shown at the diagram.
Check its contact status with pipe.
Final solution is to change parts
Display Explanation
Short- or open-circuit error of the room temperature sensor of the Zone 2 indoor unit (detected only
when the room thermostat is used)
Short- or open-circuit error of the room temperature sensor of the Zone 1 indoor unit (detected only
when the room thermostat is used)
Wired remote controller thermistor SHORT or OPEN
Zone1 Water Outlet Themistor SHORT or OPEN
Zone2 Water Outlet Themistor SHORT or OPEN
Water Inlet thermistor SHORT or OPEN
PHE Outlet thermistor SHORT or OPEN
Water Outlet thermistor SHORT or OPEN
Water TANK thermistor SHORT or OPEN
Mixing Valve thermistor SHORT or OPEN
3
G3 KIT
3-Way V/V
Backup
heater(2kW)
PWM
Pump
E901
HX_PHE
Expansion Vessel(8L)
Flow
sensor
Pressure
Relief v/v
Air Vent
Manometer
Water in
Water out
Temperature &
pressure relief valve
T_tank
Drain(Tundish)
T_w3
T_w2
T_w1
T_eva
out
T_eva
in
Booster
heater(3kW)
E902
E903
E904
Wired remote
controller
thermistor
E653
Water tank
thermistor
E904
OTHERS
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