Auxiliary PCB Biasi Activ A Plus 30C Ref. BI2035120

Biasi boilers compatible with reference BI2035120

PCB with reference BI2035120. Ten verified compatibilities: 16S and 25S.

Proven compatibility

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 the part number BI2035120 is the correct one 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 BI2035120. If it is not visible, do not identify the part from 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.

Symptoms and faults that the PCB BI2035120 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 works in basic terms, but there is a specific function that has stopped responding without any explanation.

  Cause: The auxiliary PCBs manage a part of the system separate from the main PCB; if they fail, only that function is lost and the rest continues to operate.

  Before replacing it, identify exactly what stops working and compare it with the electrical diagram of your model to confirm that it goes through this PCB.

• 02

  A specific fault code appears intermittently, disappearing on its own and reappearing later.

  Cause: An intermittent fault in a component of the auxiliary PCB (such as the integrated circuit itself) gives alerts that are not constant.

  Note the time and circumstances of each alert: if it always coincides with the same moment in the cycle, it helps to confirm that it is this PCB.

• 03

  The boiler takes longer than usual to respond to any command, or it does so irregularly.

  Cause: If this PCB acts as an intermediary between a sensor or actuator and the main board, a fault in it introduces delays or erratic responses.

  Check the connectors that link this PCB with the rest of the wiring: a poor connection can cause the same symptom without being faulty.

• 04

  A specific component (pump, valve, or other) stops receiving commands, although the rest of the boiler is functioning well.

  Cause: Auxiliary PCBs are usually responsible for controlling a specific element; their failure isolates the problem to that element.

  Check with a multimeter if power is reaching the affected component from this PCB before replacing it.

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.

Data sheet for the Biasi BI2035120 PCB.

Catalogue reference

BI2035120

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.

Main integrated circuit

Dual operational amplifier LM358N, STMicroelectronics logo, DIP-8 package