Baxi Roca PCB RS-20/20 F - Fault code C688427H 12.211.934

Baxi Roca boilers compatible with reference 122000006

PCB with reference 122000006. Two confirmed compatibilities: RS 20/20 F and R 20/20 FF.

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 reference 122000006 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 122000006. 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 122000006 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, there are no lights on the panel.

  Cause: The PCB controls the ignition; if it fails, the boiler does not respond.

  Before changing the PCB, make sure it is receiving power and that there are no blown fuses.

• 02

  The display shows fault codes that do not match other faults.

  Cause: If the PCB fails, it may give incorrect readings by not properly interpreting the signals from the sensors.

  Note the code and compare it in the manual with the corresponding component before replacing the PCB.

• 03

  The burner turns on and off repeatedly without any apparent reason.

  Cause: The module of the PCB controls the ignition power; if it is damaged, it may give unstable signals.

  Check that the flame signal and the ionizer are functioning correctly before blaming the PCB.

• 04

  The pump or the fan continues to operate even when the boiler is turned off.

  Cause: A stuck relay on the PCB can keep a component active even if the boiler does not require it.

  Disconnect the boiler from the power supply for a few seconds and check if the component turns off; if it remains on, the relay on the PCB may be 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.

Data sheet for the Baxi Roca PCB 122000006

Catalogue reference

122000006

Brand

Baxi Roca

Type of part

PCBs (control boards)

Units in stock

1 unit

Status

Refurbished

Warranty

1 year

Shipping

1-2 business days

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.

PCB code

C688427H 12.211.934

Gray module code fins

0089100040 / 12S91S0040 / MZ ST6RD690 / 1.8571.94A

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Baxi Roca RS 20/20 F manual (PDF)Document © Baxi Roca, provided as a technical reference.