Honeywell PCB Control Baxi Roca Neobit Plus 24/24F Ref. 125128870

Control PCB manufactured by Honeywell (code CS0261F), identified by its silkscreen. It features Omron relays and a microcontroller with the Atmel logo. It is the control board for Baxi Roca Neobit Plus 24/24F, Roca Neobit 24/24, and Roca Victoria Plus 24/24F boilers. Replacement requires first confirming the fault of the part through technical diagnosis, even when the boiler's control electronics fail.

Type of part: PCBs (control boards)
Status: Refurbished
Catalogue reference: 125128870
Warranty: 1 year

VAT included OUT OF STOCK

Compatibility

Baxi Roca boilers compatible with reference 125128870

PCB with reference 125128870. Five confirmed compatibilities: Neobit Plus and Neobit Plus 24/24 F.

Proven compatibility

Boiler model	Family	Verification
Baxi Roca Neobit Plus	Neobit Plus	Contrasted
Baxi Roca Neobit Plus 24/24 F	Neobit Plus	Contrasted
Baxi Roca Victoria Plus 24/24 S/P	Victoria Plus	Contrasted
Baxi Roca Victoria Plus 24/24 F S/P	Victoria Plus	Contrasted
Baxi Roca Victoria Plus 24/24 T S/P	Victoria Plus	Contrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.

Guide

How to check if ref. 125128870 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 125128870. If it is not visible, do not identify the part from 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.

Diagnosis and fault codes

Symptoms that require diagnosis on the PCB 125128870

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 neither the pump nor the gas valve respond when requesting heating.
Cause: The Omron output relay on the PCB does not switch and does not send current to the pump or gas valve.
Listen for the relay clicking when the demand is activated; if it doesn't sound, the fault points to the PCB.
02
The same fault code always appears on the screen and the reset does not solve it.
Cause: Fault of the microcontroller that manages the ignition and safety logic of the boiler.
Check in the manual that this code does not indicate another component (sensor, pressure switch) before replacing the PCB.
03
The boiler works well for a while and then locks out without any clear pattern.
Cause: A poor connection or thermal fault on the PCB manifests irregularly depending on the temperature.
Check and clean the connectors on the PCB, ensuring they fit properly, before replacing it.
04
The thermostat does not send any commands even though the boiler ignites manually.
Cause: Fault in the communication stage between the PCB and the thermostat.
Check the wiring and configuration of the thermostat before declaring the PCB faulty.

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

Data sheet for the Baxi Roca 125128870 PCB.

Catalogue reference: 125128870
Uniclima internal SKU: PLBA135
Brand: Baxi Roca
Type of part: PCBs (control boards)
Units in stock: 0 units
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.

Component manufacturer: Honeywell
Component code: CS0261F
Full label marking: CS0261F | QM 28/18 | Honeywell | 500568D9-001
Relays: Omron brand
Microcontroller: Atmel logo chip

Before purchasing

The current catalog lists it as 'Baxi Neobit Plus'; the registered boiler models are Baxiroca Neobit Plus 24/24F, Baxi Roca Neobit 24/24, and Baxi Roca Victoria Plus 24/24F.

Frequently Asked Questions

Frequently asked questions about the PCB 125128870

Is this Honeywell PCB Ref. 125128870 compatible with the Baxi Roca Victoria Plus 24/24F?

Yes, it is compatible with the Baxi Roca Victoria Plus 24/24F, as well as with the models from the Neobit Plus range.

Who manufactures the control board of the Baxi Roca Neobit Plus 24/24F?

The control board is manufactured by Honeywell; the code CS0261F is printed on the board itself.

Is the reference 125128870 the Honeywell code or from the catalog?

It is the reference used to identify the part in the catalog; the Honeywell's own code printed on the PCB is CS0261F.

What relays are installed on the control board of the Baxi Roca Neobit Plus 24/24F?

The PCB features relays from the brand Omron, according to the visible markings on the board.

When should this PCB be replaced in the Baxi Roca Victoria Plus 24/24F?

The technical diagnosis must confirm whether it is necessary to replace the control electronics of the boiler when it fails.

What is the reference for this control board?

PLBA135 is Uniclima’s internal SKU for locating this listing. To confirm compatibility, check the manufacturer’s reference and the exact appliance model.

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Honeywell PCB Control Baxi Roca Neobit Plus 24/24F Ref. 125128870