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Biasi Boiler Fault Codes and Errors
Despite being in the boiler manufacturing industry for over 70 years, Biasi’s reputation has not yet reached the levels of leading brands such as Vaillant and Worcester. And this is simply because the reliability of Biasi boilers has always been questioned by customers and heating engineers alike. But of course, this is to be expected given that the manufacturer deals in budget boilers.
That aside, finding that your Biasi boiler has broken down and is displaying fault codes can be quite frustrating. But there is no need to worry as we have prepared a special guide that will help you decode the fault codes on your boiler and even resolve them if possible.
Understanding the Biasi Fault Code Symbols
The good thing with Biasi boilers is that they inform you of the action you need to take if your boiler is displaying fault codes. Using some universal symbols, the boiler tells you whether a simple reset will clear the error code or if you have to call in a heating engineer.
By understanding the meaning of the symbol displayed alongside the error code, you can move in swiftly and fix the issue to restore your boiler to its peak condition.
That said, here are the symbols that accompany Biasi boiler fault codes and their meanings.
- RESET: This symbol indicates that the boiler suffers from a minor issue and can be reactivated by reset. All you have to do is press the reset button for about 10 seconds, and the error will clear.
- : The fault is quite severe and requires the intervention of a heating engineer. Do not attempt to fix the issue on your own as it can worsen, or you may end up inflicting more damage to the boiler.
- : The lines surrounding the symbol indicate that the sign is flashing
| Fault
Code |
Displayed
Image |
Description/ Possible cause |
| ER 01 + Reset | N/A | Ignition failure due to a safety lockout. Usually, this will be brought about by gas supply issues or faulty detection electrodes. |
| ER 02 + Reset | N/A | The boiler safety thermostat intervention has been activated, resulting in a lockout. |
| ER 03 + Reset | N/A | A general boiler lockout |
| ER 04 + | Error with the boiler’s primary circuit. Mainly due to the absence or low flow of water in the boiler system. | |
| ER 05 + | The fan control system is faulty due to it being short-circuited or lacking power. | |
| ER 06 + | The central heating temperature probe NTC is faulty | |
| ER 07 + | There is an issue with the domestic hot water temperature probe NTC. | |
| ER 08 + | The external temperature probe NTC is out of range or is short-circuited. This means that it is reading a temperature value outside the normal range, and you should check it for connection issues. | |
| ER 09 + | The flue temperature probe NTC is faulty, out of range or is short-circuited. This is usually an issue you can’t solve yourself, and you need to call in a certified heating engineer. | |
| ER 10 + Reset | N/A | The boiler is in lockout due to the flue probe intervention feature being activated. |
| N/A | Usually, the boiler flashes this alphanumeric code when there has been a flame detection error. For instance, a flame signal might be present despite the boiler being off or vice versa. | |
| ER 12 + | The central heating temperature probe NTC is reading an incorrect temperature value. | |
| ER 13 + | The DT delivery return is greater than the recommended value of 40k | |
| ER 14 + Reset | N/A | The boiler pump is faulty or internal temperatures have exceeded 105 °C |
| ER + 14 + | The temperature gradient is too high, resulting in the absence of flow in the boiler system. This usually happens when the temperature gradient has exceeded 2K/s. | |
| ER + 19 + | The domestic hot water probe has failed. | |
| ER +25 + Reset | N/A | There has been a flame detection error. The flame detection electrode is mostly to blame and needs to be checked by a heating engineer. |
| ER + 69 | N/A | Boiler lockout due to a wiring fault. |
| Li 01 | N/A | The primary circuit temperature limit was activated during a domestic hot water operation. |
| N/A | _ _ | The hyphens indicate that the boiler is on stand-by mode. The hyphens flash to simulate the boiler’s running and suggest that the anti-freeze protection feature is active. |
| N/A | The boiler needs to be filled as the water level has dropped. For this fault code, the boiler works finely and displays all the icons. However, it keeps flashing the signal FL every one second. | |
| N/A | The water pressure in the boiler is too low, and the boiler has stopped displaying the water lack error. | |
| 30c | N/A | The boiler is on stand-by and is waiting for a heating request |
| N/A | Summer mode has been activated. This means the boiler is set to provide domestic hot water and no central heating. The 31°indicates the primary circuit temperature | |
| N/A | The boiler is in winter mode, meaning both central heating and domestic hot water modes are activated. The primary circuit temperature is also displayed. | |
| N/A | The boiler is on-demand for domestic hot water or central heating power. If it is domestic hot water, then the temperature displayed is for d.h.w. | |
| N/A | Indicates burner ignition | |
| N/A | Indicates the presence of a flame. This means the burner is on. | |
| N/A | The pre-heating function is currently set at 3 stars for DHW comfort. However, as this information is not usually displayed, you can only access it on the INFO section. To confirm the presence of this function, push buttons 14 and 15 simultaneously. If present, the display panel will flash ON and OFF alternatingly for 5 seconds. The function is always active every hour and can only be controlled if you have connected a remote controller. | |
| N/A | The pre-heating function is currently set at 3 stars for DHW comfort. However, as this information is not usually displayed, you can only access it on the INFO section. To confirm the presence of this function, push buttons 12 and 13 simultaneously. If present, the display panel will flash ON and OFF alternatingly for 5 seconds. The function is always active every hour and can only be controlled if you have connected a remote controller. | |
| N/A | The boiler is in the anti-freeze phase, and both the bP and temperature are flashing. | |
| N/A | The boiler has entered the antifrost phase. As a result, both the AF and temperature are flashing on display. | |
| N/A | The boiler is set to central heating mode, and all other symbols are disabled. | |
| N/A | The boiler system is communicating that the remote control has been connected. Expect to see the display flashing once every 4 seconds. | |
| N/A | The boiler is set to domestic hot water mode, and all other symbols are disabled. | |
| N/A | The boiler pump has been activated and is ready for the post circulation phase. The Po symbol and temperature will be flashing on the display panel. | |
| N/A | The burner ignition is delayed due to some system settings. | |
| N/A | The boiler needs maintenance and is indicated by the display panel flashing the wrench symbol without showing any errors. | |
| LP | N/A | The chimney sweep function has been activated. The activation of the chimney sweep function occurs when the “parameter P09=01” is visualised. The following balance must be realised for this to be achieved: LP= minimum dhw hP =minimum heating cP =maximum heating dP =maximum dhw. |
| N/A | The chimney sweep function has been activated. The activation of the chimney sweep function occurs when the “parameter P09=01” is visualised. The following balance must be realised for this to be achieved: LP= minimum dhw hP =minimum heating cP =maximum heating dP =maximum dhw. |