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Troubleshooting
If the unit has some problem to work properly, the LED on hydro unit will flash and some error codes will be displayed on the
controller .
The following table described the explanation of error codes on the LCD display .
Thermistor
f Check its resistance . 10kohm@25 °C (Hydro unit), 200kohm@25 °C (DHW Tank)
f
f Check its location as shown at the diagram .
f
f Check its contact status with pipe .
f
f Final solution is to change parts
f
Display
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
Air Vent
Manometer
T_w3
Backup
heater(2kW)
T_w2
E902
T_eva
HX_PHE
out
T_eva
in
T_w1
E901
PWM
Pump
Expansion Vessel(8L)
Water in
G3 KIT
Pressure
Relief v/v
3-Way V/V
3
E903
Flow
sensor
ENGLISH-51
Explanation
Water out
Temperature &
pressure relief valve
Drain(Tundish)
T_tank
E904
Booster
heater(3kW)
Wired remote
controller
thermistor
E653
Water tank
thermistor
E904
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