K4
Changes in models reserved.
Dimensions not binding!
Operation
F37
The low water pressure error can be caused by insufficient water pressure (lower than ‚Water pressure low
limit‘ or water pressure switch contact is open). In error mode, the heat demand and the supply pump are
switched off. Heat demands are ignored.
Diverting 3WV is moved in CH position (if it is not already there).
Water filling parameter 0 (disable)
This error is self resolved when water pressure value exceeds the ‚Water pressure nominal‘ or water
pressure switch contact is closed.
Water filling parameter 1 (enable)
By pressing the K4 button, the filling valve is activated for a period of time equal to ‚Water filling timeout‘.
If during that period, water pressure value exceeds the ‚Water pressure nominal‘ or water pressure switch
contact is being closed, this error code is cancelled and the water filling valve is switched off.
Otherwise, if at the end of the ‚Water filling timeout‘, water pressure value is still below the ‚Water pressure
low limit‘ value or water pressure switch contact is still open, this error code is blinking.
Another manual water filling attempt is allowed only after a power down (power up) of the main voltage.
F39
Outdoor sensor out of normal operating range (short circuit or open circuit). If the NTC sensor goes in short
circuit and this condition lasts for more than 3 seconds, this error is displayed. In case the sensor is back to
the normal operating range, the error is dismissed. The normal operating range for the outdoor sensor is from
-40°C to +50°C. With the sensor in open circuit, the error will be generated only if a curve is selected:
OTC will be disabled but heating mode is possible. In case two or more sensors are broken, the controller will
pick up the first one that was outside of operating range. Resolving this situation can only be achieved if the
sensor is within operating range again.
F40
High water pressure error caused by the water pressure sensor. The water pressure exceeds the set ‚Water
pressure high limit‘. In error mode, the heat demand and the pumps are switched off.
F41/F42/F43 Water filling (automatic). Auto water filling functionality is disabled if boiler is set in OFF mode.
F47
Water pressure sensor not connected. In error mode, the heat demand and the pumps are switched off.
Resolving this error situation can be achieved only if the sensor is connected again.
F50
DHW sensor out of normal operating range (short circuit or open circuit). If NTC sensor goes outside the range
(-5÷125°C), this error will be generated. In case the sensor is back to the normal operating range, the error is
dismissed. In error mode, heat demands will be disabled. In case 2 or more sensors are broken, controller will
pick up the first that was outside the operating range. Resolving situation can be achieved only if the sensor is
within operating range again.
F51
Solar panel sensor (PT1000) out of normal operating range (short circuit or open circuit). If NTC sensor exceeds
the range (-20÷150°C), error will be generated. In case sensor is back to the normal operating range, the error is
dismissed. In error mode, heat demands are not disabled. In case two or more sensors are broken, the
controller will pick up the first one that was outside of operating range. Resolving this situation can only be
achieved if the sensor is within operating range again.
F52
DHW sensor out of normal operating range (short circuit or open circuit). If the NTC sensor exceeds the range
(-5÷125 °C), this error will be generated. In case sensor is back to the normal operating range, the error is
dismissed. In error mode, heat demands will be disabled. In case 2 or more sensors are broken, controller will
pick up the first that was outside the operating range. Resolving situation can be achieved only if the sensor is
within operating range again.
F53
Exhaust sensor out of normal operating range (short circuit or open circuit). If NTC sensor goes outside the
range (-5÷125 °C) and this condition lasts for more than 3 seconds, error will be generated. In case sensor is
back to the normal operating range, error is gone. In error mode, heat demands will be disabled. n case two or
more sensors are broken, the controller will pick up the first one that was outside of operating range. Resolving
this situation can only be achieved if the sensor is within operating range again.
F81
Drift test waiting. System is waiting for sensor drift test.
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