Below there are 7 tables that will help to understand the causes of failure of boiler. Each of them is dedicated to the particular model of the Biasi brand. Pay your attention that depending on the model of the boiler, the table shows the error codes or the way the bulbs are lit as an indicator of the reason why the boiler is not working. The main apparent problem of the boiler is that it gives no hot water. Knowing the usual light of bulbs you will immediately notice an unusual combination and will be able to understand with the help of the manual what is not working. It could help you in troubleshooting.
| Lamp 1 | Lamp 2 | Lamp 3 | Description |
|---|---|---|---|
| Flashing lamp | Lamp OFF | Lamp OFF | Normally operating boiler |
| Lamp OFF | Flashing lamp | C.h. operation | |
| Flashing lamp | Lamp OFF | Frost protect operation | |
| Lamp OFF | Flashing lamp | Faulty c.h. temperature probe NTC | |
| Lamp ON | Lamp OFF | Faulty flue temperature probe NTC | |
| Flashing lamp | Lamp ON | Faulty primary circuit (no water or low c.h. pressure) | |
| Flashing lamp, alternate with another lamp | Flashing lamp, alternate with another lamp | Lamp ON | Faulty primary circuit (absence of flow) |
| Flashing lamp | Flashing lamp | Faulty air pressure sensor | |
| Flashing lamp | Lamp ON | Flashing lamp | Lack of burner ignition (no ignition signal from the full sequence ignition device) |
| Lamp ON | Flashing lamp | Safety thermostat lock out | |
| Lamp ON | Flue temperature probe NTC lock out | ||
| Flashing lamp | Flashing lamp | Flame detection error | |
| Lamp OFF | Lamp OFF | ||
| Lamp OFF | Lack of power supply or fauly electronic control p.c.b. |
| Code | Anomaly |
|---|---|
| 01E | Ignition failed lockout |
| 02E | Safety thermostat trip lockout |
| 03E | Generic lockout |
| 04E | No water in the heating or circulation circuit |
| 05E | Flue gas pressure switch anomaly |
| 06E | Heating NTC probe anomaly |
| 07E | D.h.w. NTC probe anomaly |
| 08E | External NTC probe anomaly |
| 11E | Parasite flame |
| 14E | No circulation or pump failure or activation due to primary temperature limit |
| Lamp 1 | Lamp 2 | Lamp 3 | Description |
|---|---|---|---|
| Flashing lamp | Lamp OFF | Lamp OFF | A short pulse every 4 seconds: stand-by condition Function selector in O position. Anti-freeze system active |
| 1 second pulse every 2 seconds: normally operating boiler. Function selector in #5 or position | |||
| Flashing lamp | C.h. operation | ||
| Flashing lamp, alternate with another lamp | Flashing lamp, alternate with another lamp | D.h.w. operation | |
| Flashing lamp | Flashing lamp | Lamp OFF | Frost protect operation |
| Lamp OFF | Lamp OFF | Flashing lamp | D.h.w. operation Excessive temperature on primary circuit |
| Flashing lamp | Faulty c.h. temperature probe NTC | ||
| Lamp ON | Faulty d.h.w temperature probe NTC | ||
| Flashing lamp | Lamp ON | Faulty primary circuit (no water or absence of flow) | |
| Flashing lamp | Lack of burner ignition (no ignition signal from the full seqence ignition device) | ||
| Lamp ON | Flashing lamp | Lamp OFF | Ignition gas pressure adjustment |
| Flashing lamp | Lamp ON | Lamp ON | Minimum gas pressure adjustment |
| LCD | FUNCTION |
|---|---|
| Er 01 +RESET | Lack of burner ignition on safety lockout |
| Er 02 +RESET | Safety thermostat intervention lockout |
| Er 03 + RESET | General lockout |
| Er 10 +RESET | Flue probe intervention lockout |
| Er 14 +RESET | Faulty pump or primary temperature above 105°C |
| Er 15 +RESET | None or too low water flow; Faulty pump (temp, difference between probes higher than 35° C) |
| Er 16 +RESET | Possible exchange of NTC probes (Flow or Return) or pump wrongly mounted (up- side – down) |
| Er 17 +RESET | Faulty c.h. temp, probe NTC (Flow or Return) |
| Er 18 +RESET | Faulty primary circuit (no water or absence of flow) |
| Er04 | Faulty primary circuit (no water or absence of flow) |
| Er05 | Faulty fan control system |
| Er06 | Faulty c.h. temp, probe NTC flow |
| Er08 | Faulty external temp, probe NTC |
| Er09 | Faulty flue temp, probe NTC |
| Er12 | Fauty c.h. temp, probe NTC return |
| Code | Anomaly |
|---|---|
| E01 | Lack of burner ignition |
| E02 | Safety thermostat lockout |
| E03 | General lockout |
| E04 | Lack of circulation pump |
| E05 | Faulty fan control system / air pressure / flue thermostat |
| E06 | Faulty c.h. temp, probe NTC1 or NTC2 |
| E07 | Faulty d.h.w. temp, probe NTC |
| E08 | Faulty external temp, probe NTC (with K set) |
| E11 | Flame detection error |
| E14 | Lack of circulation T >105°C |
| LCD | FUNCTION |
|---|---|
| cF | Pre-heating function 3 stars D.H.W. comfort. This information is not displayed. “cF” (the signal “cF” is alternated to the C.H. temperature value until the end of this function). |
| The function is con- firmed showing ON or OFF alternating for 5 sec. | |
| This function is always active at every hour (it’s not possible to set the time slots unless a remote control is connected). | |
| bP | Boiler in anti-freeze phase (bP flashing + temperature flashing). |
| Boiler protection only. | |
| AF | Boiler in antifrost phase (AF flashing + temperature flashing). |
| System protection via additional external thermostat. | |
| 78+ temperature | Remote control connected (one flash every 4 sec.) |
| C 0 | Set D.H.W. (all other symbols are disabled) |
| Po | Pump activated for the post-circulation phase (Po flashing + temperature flashing) |
| uu | Delayed burner ignition for setting the system (uu flashing + temperature flashing) |
| Maintenance required The wrench symbol is flashing (without showing any error) | |
| LP | Boiler in chimney sweep in function. |
| The activation of the chimney sweep occurs configuring the “param-eter P09=01” and is visualized: | |
| LP= minimum D.H.W. hP= minimum heating cP= maximum heating dP= maximum D.H.W.. The transition occurs with keys 18 (increase) and 17 (decrease) D.H.W. temperature. |