ERROR CODE: E03 ERROR TYPE: High-Temperature Warning PROBABLE CAUSE: This occurs when the supply or return temperature exceeds 90°C SOLUTION:
Ensure that the boiler’s water valves are on. If not, turn on the valves and reset the device. 2. If the boiler gives this error in the winter mode, ensure that the valves of at least one radiator are on. If not, turn on the valves of at least one radiator and reset the device.
Ensure that the resistance of the water temperature sensors is correct.
Sensors may be malfunctioning. If they do not give the correct resistance values, replace them and reset the device.
Internal bypass may not be functional. After replacing the 3-way valve set and resetting the device, make sure the error is removed.
The pump connection cables may be loose or displaced or lose their conductivity. Check the connections. If there is a problem, replace the cables and reset the device.
There may be congestion in the installation. Observe the temperature changes in both the summer and winter mode while the boiler is running. If there is a blockage, clean the system.
Ensure that the circulation pump is working. If the pump is defective, replace it.
If the problem persists, the mainboard may be defective. Replace the mainboard.
