PCB Baxi Roca Victoria RS 20/20 Ref. 122123000
Control PCB for Baxi Roca Victoria RS 20/20 boilers. The main chip has the proprietary Baxi Roca brand (CS 4376); it also includes an STMicroelectronics LM339N comparator, a Toshiba TD62083AP driver, CMOS logic, and a Schrack RP41202 relay of 24V. Screen-printed board code: 6044D / 12.063.03. Replacement requires first confirming the fault of the part through technical diagnosis, even when the PCB stops controlling the boiler correctly.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 122123000
- Warranty
- 1 year
Baxi Roca boilers compatible with reference 122123000
PCB with reference 122123000. Four confirmed compatibilities: RS 20/20 and RS 20/20 (V.01).
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Baxi Roca RS 20/20 | Baxi Roca Victoria RS 20/20 | Contrasted |
| Baxi Roca RS 20/20 (V.01) | Baxi Roca Victoria RS 20/20 | Contrasted |
| Baxi Roca RS 20/20 GN (V.01) | Baxi Roca Victoria RS 20/20 | Contrasted |
| Baxi Roca RS 20/20 GP (V.01) | Baxi Roca Victoria 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. 122123000 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 122123000. 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 122123000
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 or intermittently locks out.
Cause: The control logic of this PCB can fail intermittently before completely stopping functioning.
Note if the fault always occurs at the same point in the ignition cycle: it helps to distinguish a PCB fault from a one-time fault.
- 02
The relay click is heard, but the corresponding element does not start.
Cause: The relay on this PCB gives the command, but if it is worn out, it does not close the internal contact properly.
With the boiler off, check with a multimeter if there is continuity in the circuit that controls the relay before replacing the PCB.
- 03
Some element (pump, gas valve) is not receiving power even though everything else is working.
Cause: The relay on this PCB is the one that allows power to that specific component.
First, check that the component itself works by powering it directly before assuming that the fault is with the PCB.
- 04
The boiler turns on and off by itself erratically, without a clear pattern.
Cause: In old PCBs like this one, the logic can degrade over time and cause random faults.
Visually check for moisture, oxidation, or swollen components on the PCB before deciding on the replacement.
Fault codes Baxi Roca that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 60-90 | Flame relay is not working properly or is stuck. | The flame relay is on the PCB; if its contacts stick or its coil fails, the electronics do not manage/detect the flame and it locks out. Check the coil voltage and relay switching on demand on the PCB. |
| 50-70-90 | Safety relay fault: does not close after demand. | The safety relay is integrated into the PCB; if it does not close due to damaged contacts/cold solder joints or a control circuit fault, the PCB does not power the safety/gas chain. Check the PCB for coil activation and relay contact closure after the command. |
| 40-60-70-90 | Safety relay: very long start-up timing. | The ignition timing is managed by the PCB through the safety relay; if the relay/control circuit of the board does not switch in time, this code appears. Check control signals and timings on the PCB and the effective switching of the relay. |
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 122123000 PCB.
- Catalogue reference
- 122123000
- Uniclima internal SKU
- PLBA144
- Brand
- Baxi Roca
- Type of part
- PCBs (control boards)
- Units in stock
- 3 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.
- PCB code (front)
- 6044D / 12.063.03
- main chip
- ROCA CS 4376
- IC4 (comparator)
- ST LM339N W990X9740 MALAYSIA
- IC5 (driver)
- TOSHIBA JAPAN TD62083AP 9T9NK5
- CMOS logic
- MC14093BCP CPFW9803
- relay RL1
- SCHRACK RP 41202 24V
- The main chip carries the Roca brand; the auxiliary components (comparator, driver, relay) are from other manufacturers, as is common in these PCBs.
Frequently asked questions about the PCB 122123000
What chip does the main PCB of the Baxi Roca Victoria RS 20/20 have?
Is the PCB 100% Roca or does it contain components from other manufacturers?
When should the PCB of a Baxi Roca RS-20/20 be replaced?
