Junkers CERASTAR CERAMINI Boiler

An issue with the exhaust outlet has been detected specifically at the combustion chamber. This could indicate a problem with flue gas extraction directly from the combustion area, such as a blockage.

The exhaust gas NTC sensor, specifically the one located on the flow control, has an open circuit (no signal) or a short circuit (incorrect signal). This affects exhaust gas monitoring and safety.

An issue has been detected with the exhaust outlet by the flow guard system. This typically indicates a problem with flue gas discharge, such as a blockage or poor flow.

The exhaust gas NTC sensor located specifically on the combustion chamber has an open circuit (no signal) or a short circuit (incorrect signal). This sensor monitors safety and combustion efficiency.

The NTC sensor that measures the hot water temperature is experiencing either an open circuit (no signal) or a short circuit (incorrect signal). This prevents accurate temperature readings for hot water.

There is a lack of communication or signal detection between the external control unit (TA 211 E or RAM) and the boiler's main circuit board. This can prevent proper operation or control.

The NTC sensor designated for memory functions (e.g., a storage tank or specific temperature settings) has an open circuit (no signal) or a short circuit (incorrect signal). This can affect temperature management.

The boiler's main circuit board cannot detect the coding plug. This plug is essential for the boiler to operate correctly and interpret its settings.

The outside temperature sensor (TA 211 E) is not providing a signal to the boiler, indicating a break in communication or a fault with the sensor itself. This affects weather-compensated control.

The boiler is not receiving the expected feedback voltage signal from the LSM 5 unit. This unit is typically involved in controlling the exhaust flap, affecting safe flue gas operation.

A general internal error has occurred within the boiler's main circuit board. This indicates a component or software malfunction that prevents normal operation.

The NTC sensor that measures the heating flow temperature is showing either an open circuit (no signal) or a short circuit (incorrect signal). This prevents the boiler from accurately monitoring the heating water temperature.

The NTC sensor responsible for monitoring the burner temperature has detected a temperature higher than the allowed limit. This indicates a potential overheating issue.

The NTC sensor for the burner has an interruption, meaning its signal is lost or discontinuous. This prevents accurate temperature measurement at the burner.

The minimum pressure switch has activated, indicating that the heating system's water pressure has dropped below the safe operating threshold, typically 0.5 bar. The boiler will likely stop operating.

The Safety Temperature Limiter (STB) has activated, indicating that a critical temperature limit has been reached or exceeded within the boiler. This is a safety shutdown.

The boiler is not detecting any ionization current, which means there is no flame present or the flame detection system is not working. This will prevent the boiler from igniting or operating.

The boiler is detecting an incorrect ionization signal, which means there's a problem with how the flame is being detected or confirmed. This can lead to safety shutdowns.

The boiler detects an ionization current (indicating a flame) even after it has attempted a controlled shutdown. This is a safety critical issue as gas may still be burning or leaking.

The natural gas connection flow pressure is measured to be outside the required range of 18 to 24 mbar. When this happens, the boiler cannot be adjusted or started safely.