When your Sime boiler starts showing unusual behaviors, the first thing you should do is check if it’s displaying any error codes on its control panel. These codes are a direct way your boiler tries to communicate what’s failing within its system. Although they might seem confusing at first, understanding them is key to solving specific issues and avoiding further damage or even the need for replacing your boiler.
In this article, we present a complete table of error codes for Sime boilers, along with their description, cause, and most importantly, the recommended solution for each one. Before diving into the table, let’s clarify some concepts that might be new or a bit technical for you.
- Safety Thermostat (TS): A device designed to stop the boiler’s operation in case the temperature exceeds a safe limit, thus preventing damage from overheating.
- Sanitary Probe (SS) and Heating Probe (SM): Sensors that measure the water temperature in different parts of the system, ensuring the boiler operates efficiently and safely.
- Air Transducer: A component that measures the air pressure inside the boiler to ensure proper combustion.
- Pressure Switch: A device that checks the water pressure within the system, ensuring it’s within safe operating ranges for the boiler.
With these concepts clear, let’s now look at the error codes table:
| Error | Description | Cause | Solution |
|---|---|---|---|
| F01 | Lockout due to excessive temperature. Safety thermostat (TS) intervention. The boiler does not start, and the burner is locked. | Press the reset button (RESET) on the control panel to restart the equipment. | |
| F02 | Problems with the sanitary probe (SS) when present. The sensitive part of the sanitary probe is open or has a short circuit. | Seek qualified personnel to replace the sanitary probe. | |
| F03 | Indicates problems with the heating probe (SM). The sensitive part of the heating probe is open or has a short circuit. | Seek qualified personnel to replace the heating probe. | |
| F04 | Flame not detected at the end of a complete start sequence, due to actual absence of flame or because the card does not detect it. Also, the detection of a parasitic flame gives error F 04. | Press the RESET button on the control panel for the equipment to restart. It can only be reset up to 5 consecutive times. After this, a qualified technician must be sought to resolve the fault. | |
| F05 | Indicates an air pressure anomaly below the threshold of the transducer. If the correct pressure value is not detected after 10 seconds of fan activation, F 05 appears until the pressure normalizes. | This error should resolve automatically, after which the boiler restarts and continues to operate normally. Otherwise, a technician must be sought. | |
| F06 | Indicates errors or faults in the external probe (if there is one). If the external probe is open, poorly installed, or has a short circuit, the boiler stops. | Seek a qualified technician to repair, properly install, or replace the external probe. | |
| F07 | Indicates a malfunction of the air transducer (it is open or has a short circuit). The boiler stops. | Seek a qualified technician to repair or replace the air transducer. | |
| F08 | Indicates an anomaly in the air pressure with the fan stopped. This occurs when the boiler, while operating, detects the air signal but the fan does not receive electrical power. The equipment stops. | Seek a qualified technician to repair or replace the air detection or the fan. | |
| F09 | Indicates a problem in the Sealed/Open configuration, possibly an anomaly in the wiring of the X15 card connector. The boiler stops. | Request a qualified technician to correctly perform the Sealed/Open configuration, or to adjust the wiring. | |
| F10 | Indicates an anomaly due to low water pressure. The pressure switch detects that there is less than 0.5 bars, and the boiler stops working. | The system needs to be filled with water, opening the filling valve until the pressure is restored between 1 and 1.2 bars. (We detail the procedure later.) | |
| F11 | Indicates an anomaly due to lack of water circulation. The lack of water circulation is detected whenever the temperature increase read by the heating probe is greater than 5 °C per second. If so, the boiler stops, and does not restart until the temperature on the heating probe drops below 45 °C. | It is necessary to unclog or replace the water circulation pump. This work must be done by a qualified technician. |
Our Advice
Before attempting to solve any error on your own, it’s crucial to carefully read your Sime boiler’s user manual and follow the safety instructions. If you don’t feel confident or the problem persists after attempting the suggested solution, we strongly recommend contacting a qualified technician. Remember, prevention is better than cure, and when it comes to heating systems, safety should always be your priority.
Error codes in Sime boiler
Troubleshoot error code “F11” in Sime boiler
Troubleshoot error code “F10” in Sime boiler
