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ERROR CODE: F40
ERROR TYPE: High Water Pressure Error
PROBABLE CAUSE: This occurs when the water pressure sensor detects high water pressure (≥2.9 bar) which may be dangerous for your device.
SOLUTION:
1- Check the heater circuit water pressure of your device. If the value is greater than 2.9 bar, reduce the water pressure. If the water pressure value is lower than 2.9 bar and the problem persists, replace the mainboard.
2- Check the connection and conductivity of the pressure sensor cables. If there is a problem, replace the cables.
3- Remove the connectors on the water pressure sensor and measure the DC voltage values between the input and GND at the cable ends while the boiler is connected to the power supply. Check whether the measurement is within the 4.9-5.1 V DC range. If the value is out of this range, replace the pressure sensor.
4- If the problem persists, replace the mainboard.
5- Check if the pressure of the expansion tank is above 0.5 bar. If the pressure is low, pressurize by pumping air up to 1 bar. If this problem repeats within 6 months, replace the expansion tank.
6- Make sure the filling valve is completely closed and functional. Replace if necessary. -
7- There may be a hole in the plate heat exchanger. If the water pressure increases while the filling tap is off and the boiler is not operating, replace the plate heat exchanger.
Updated on 9 January 2024, Tuesday
