Biasi MLB 24SR PCB Ref. BI1045104
RefurbishedBiasiPCBs (control boards)

Biasi MLB 24SR PCB Ref. BI1045104

Stock · 1 unit

Biasi PCB MLB 24SR Ref. BI1045104, composed of two boards: one for power and another for control. 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. It is recommended to replace it when symptoms of malfunction are present or when issues with ignition and overall operation are detected.

VAT included

Compatibility

Compatible Biasi boilers

PCB. Seven confirmed compatibilities: 424S and (24 S).

Proven compatibility

Boiler modelFamilyVerification
Biasi 424SGAIAContrasted
Biasi (24 S)M.L.B.Contrasted
Biasi (24 SR)M.L.B.Contrasted
Biasi (24 SR)MLB-PRISMAContrasted
Biasi 24SPRISMAContrasted
Biasi 24SRPRISMAContrasted
Biasi 24SRRIVAContrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

How to check if it is the part for your boiler

What determines it is not the boiler model, but the reference printed on the part you already have installed.

  1. 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.
  2. Check the full boiler model on its data plate and look for it in the model associations on this page.
  3. Compare the connections and physical body with the original part before installation.
  4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Diagnosis and fault codes

Symptoms and faults that the PCB (control board) resolves

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.

    Bypass the thermostat directly at the terminals of the PCB: if it starts like this, check the thermostat and the wiring.

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.

Technical data

Biasi PCB data sheet

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

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

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

Frequently asked questions about the PCB (control board)

Does this PCB Ref. BI1045104 work for the Biasi Riva 24SR?
Yes, the Riva 24SR is among the Biasi boilers compatible with this PCB.
Is the PCB of the Biasi Prisma 24SR a single part or an assembly?
It is a set of two PCBs: one for power, with a transformer and relays, and another for control.
How do I recognize the control board in the Biasi Gaia 424S assembly?
It is the board with integrated circuits, blue potentiometers, and three LEDs, different from the power board.
Does this PCB BI1045104 work for both the MLB-Prisma 24SR and the Prisma 24SR?
Yes, both models are on the list of Biasi boilers compatible with this reference.

Spare parts related to Biasi M.L.B.

Entrega calculada por destinoDelivery time shown at checkout
1-year warrantyreviewed and tested
14-day returnuninstalled parts
Technical supportwe verify your model
Biasi MLB 24SR PCB Ref. BI1045104