Baxi Roca PCB RS-20/20 F - Fault code C688427H 12.211.934
The Baxi Roca RS-20/20 F PCB, with reference C688427H, is the component that controls the ignition, burner modulation, pump, and safety features of the boiler. If it malfunctions, the boiler may fail to start, become locked, or operate erratically. This board is compatible with models such as the RS 20/20 F and the R 20/20 FF, among others. A technician must confirm through diagnosis whether it needs to be replaced when these malfunction symptoms are detected.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 122000006
- Warranty
- 1 year
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
| Boiler model | Family | Verification |
|---|---|---|
| Baxi Roca RS 20/20 F | RS 20/20 | Contrasted |
| Baxi Roca R 20/20 FF | RS 20/20 | 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 the reference 122000006 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 122000006. 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.
Symptoms that require diagnosis on the PCB 122000006
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
- Uniclima internal SKU
- PLCRS20FFR
- Brand
- Baxi Roca
- 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.
- 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.
Frequently asked questions about the PCB 122000006
Is the Roca RS-20/20 F PCB with code C688427H 12.211.934 compatible with my boiler?
Does this PCB work only for the Baxi Roca RS-20/20 F or also for other models?
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