Baxi Roca PCB RS 20/20 F Ref. 122121410
The control PCB Roca Baxi RS 20/20 F Ref. 122121410 manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, may lock out, or may exhibit erratic behavior. Users may notice issues related to fault codes such as 60-90, which indicates that the flame relay is not functioning properly or is stuck, or 50-70-90, which points to a defect in the safety relay. This PCB is compatible with the RS 20/20 F boiler, among other models in the RS 20/20 range. A technician must confirm through diagnosis whether it is necessary to replace it upon detecting faults in its operation to avoid further issues.
Baxi Roca boilers compatible with reference 122121410
PCB with reference 122121410. A proven compatibility: RS 20/20 F.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Baxi Roca RS 20/20 F | 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 ref. 122121410 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 122121410. 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 122121410
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 is completely dead: no indicator lights on and no response when pressing anything.
Cause: A fault in the power supply stage of the PCB leaves the rest of the control circuit without voltage.
First, check the fuse on the PCB itself and ensure that there is mains voltage at the input terminal block.
- 02
A click is heard when requesting heating, but the boiler does not ignite the burner.
Cause: That click is the relay on the PCB activating the gas or the fan; if nothing happens afterward, the fault is usually in that stage of the PCB.
Before replacing it, check that the gas valve and the ignition electrode have continuity, to avoid confusing a downstream fault with the PCB.
- 03
The reset button does nothing, the boiler remains locked.
Cause: The reset is managed by the PCB itself; if the microprocessor does not respond, the button loses its effect even if pressed correctly.
Cut the power to the boiler for 2-3 minutes and then restore power before declaring the PCB faulty: some lockouts reset with a power cut.
- 04
The boiler runs for a few minutes and then stops on its own, always at the same point in the cycle.
Cause: A component on the PCB that fails due to temperature interrupts the cycle always at the same phase, such as the fan start-up.
Note the exact moment it stops each time: if it coincides with the water pressure or ignition, it's advisable to rule out those points first.
Fault codes Baxi Roca that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 60-90 | Flame relay is not working properly or is stuck/off. | The flame relay is integrated into the PCB 122121410; if it sticks or does not switch, the PCB does not validate the ionisation signal and locks out. Check if the PCB energises the relay and if it switches by measuring voltage/continuity during demand; if it does not operate with correct inputs, replace the PCB. |
| 50-70-90 | Fault in the safety relay, does not close after demand. | The safety relay is part of the PCB 122121410; if its contacts do not close, the safety chain is not enabled and the boiler goes into lockout. Check the relay excitation and contact continuity on the PCB during demand; if it does not switch with correct input signals, the PCB is faulty. |
| 40-60-70-90 | Safety relay, very long ignition timing. | The ignition timing and safety relay are governed by the PCB 122121410; a fault in the relay/timer on the PCB causes the time to exceed and lock out. Check the control board to relay command and spark/validation times; if the relay does not release in time with correct input conditions, replace the PCB. |
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 122121410
- Catalogue reference
- 122121410
- Uniclima internal SKU
- CECRS2020FX
- Brand
- Baxi Roca
- Type of part
- PCBs (control boards)
- Units in stock
- 2 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.
- Logo printed on the front face
- Baxi Roca
- Code printed on the back side (partial)
- 12030 02
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 122121410
Is this Baxi Roca PCB suitable for an RSF-20/20 (V.00)?
Is the same PCB Ref. 122121410 suitable for both the RS 20/20 F and the RS 20/20 T?
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