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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, Solar)
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
E903
Water Outlet
thermistor
Tw3
Water Out
E902
Tw2
Tw1
Water inlet
E901
Water In
ENGLISH-43
Explanation
Wired remote
controller
thermistor
E653
Water tank
thermistor
E904
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