Nora 28/28 F Control PCB - Code 1271002330
Control PCB for the Nora 28/28 F boiler. The label does not indicate the manufacturer's name: it only contains internal codes (1271002330, chips U3 SS27R30Tx_v11 and U4 961380_v11) and an OMRON relay. Replacement requires first confirming the fault of the part through technical diagnosis, even when the control board stops functioning normally.
Compatible Baxi Roca boilers
PCB. A proven compatibility: 28/28 F.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Baxi Roca 28/28 F | NORA | 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 it 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 —. If it is not visible, do not identify the part by 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
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 unresponsive: no display, no indicator lights, no buttons.
Cause: If the PCB does not receive or manage the power properly, the boiler will be completely dead.
Check the internal fuse of the PCB and the input voltage before replacing it.
- 02
An error code appears on the display that does not correspond to any checked component.
Cause: The PCB reads the sensors and generates the fault code; the reading may fail even if the sensor is functioning properly.
Measure the continuity and the value of the NTC sensors with a multimeter before replacing the PCB.
- 03
It turns on, but the pump or the fan does not start when it should operate.
Cause: The relays that power these components are integrated into the control board.
Measure if there is voltage reaching the pump and the fan at the moment they should activate, before replacing the PCB.
- 04
You press reset and the boiler does not respond, it remains locked.
Cause: The microcontroller on the PCB processes that pulse; if it does not respond, the reset is useless.
Check that the reset button is not mechanically stuck before replacing 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.
- Uniclima internal SKU
- PLC-ROC17X
- 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.
- Code printed on the PCB
- 1271002330
- Screen-printed model
- NORA + 28FF
- Chip / firmware U4
- 961380_v11
- Main relay
- OMRON 12VDC — relay marking, it is not the brand of the PCB.
- Batch / unit number
- Ltn°46353 - n°00076
- Fuse F1
- 3.15 A
- Right zone marking
- E8P2BE3 / 43·10 / C=550
Frequently asked questions about the PCB (control board)
What fault indicates that the control board of the Nora 28/28 F needs to be replaced?
What relay is mounted on the control board of the Nora 28/28 F?
What are the U3 and U4 codes that appear on the label of the Nora 28/28 F PCB?
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