Biasi MLB 24SR PCB Ref. BI1045104
Biasi PCB MLB 24SR Ref. BI1045104, composed of two boards: a power board and a control board. This part is responsible for managing the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, lock out, or behave erratically. It is compatible with models from the GAIA, M.L.B., MLB-PRISMA, and RIVA ranges, such as the 424S, 24 S, and 24 SR, among others. A technician must confirm through diagnosis whether it needs to be replaced when symptoms of malfunction are present or when issues are detected in ignition and overall operation.
Compatible Biasi boilers
PCB. Seven confirmed compatibilities: 424S and (24 S).
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Biasi 424S | GAIA | Contrasted |
| Biasi (24 S) | M.L.B. | Contrasted |
| Biasi (24 SR) | M.L.B. | Contrasted |
| Biasi (24 SR) | MLB-PRISMA | Contrasted |
| Biasi 24S | PRISMA | Contrasted |
| Biasi 24SR | PRISMA | Contrasted |
| Biasi 24SR | RIVA | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if it is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference —. If it is not visible, do not identify the part by its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms that require diagnosis on the PCB
The PCB controls the ignition, modulation, and safety features of the boiler. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler does not ignite and the spark transformer does not make any sound.
Cause: The power PCB does not send the command to the ignition block or to the relays.
Check that power is reaching the power PCB and that the connector to the control board is properly seated.
- 02
The three LEDs on the control board are flashing in a sequence that is not usual.
Cause: It is a fault code that the control board emits via LEDs when detecting an internal fault.
Count the blinks and compare them with the fault code table in the manual before replacing the assembly: each sequence indicates a different cause.
- 03
The flame ignites but cuts off immediately and the boiler locks out.
Cause: The relay on the power PCB does not maintain the ignition signal for the necessary time.
Check that the blue potentiometers on the control board are not moved from their position before replacing the PCBs.
- 04
The thermostat is calling for heat, but the boiler is not responding even though the main pilot light is on.
Cause: The control board does not transfer the demand signal to the power board.
Do not force, hit, or bridge the component. Request a technical check according to the equipment manual before deciding on its replacement.
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Biasi PCB data sheet
- Uniclima internal SKU
- PLC-BI24R1FX
- Brand
- Biasi
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Composition
- Set of two PCBs: one for power (transformer/ignition block and relays) and one for control (integrated circuits, blue potentiometers, 3 LEDs)
Frequently asked questions about the PCB (control board)
Does this PCB Ref. BI1045104 work for the Biasi Riva 24SR?
Is the PCB of the Biasi Prisma 24SR a single part or an assembly?
How do I recognize the control board in the Biasi Gaia 424S assembly?
Does this PCB BI1045104 work for both the MLB-Prisma 24SR and the Prisma 24SR?
Spare parts related to Biasi M.L.B.
