Siemens Control Board LMU34.210B349 Baxi Roca Novanox Platinum 24/24F Ref. 125569154
Control module manufactured by Siemens Building Technologies (code LMU34.210B349, material code 56.8835.2), Made in Germany. It operates at 230V/50Hz, with software version V02.10 and TSAmax of 5 seconds. It is the control board for Baxi Roca boilers from the Neodens, Novadens, and Platinum ranges; it should be checked when the electronic control of the boiler fails. Replacement requires a technical diagnosis.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 125569154
- Warranty
- 1 year
Baxi Roca boilers compatible with reference 125569154
PCB with reference 125569154. Nine confirmed compatibilities: Platinum 24/24F and Platinum 28/28F.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Baxi Roca Platinum 24/24F | Platinum | Contrasted |
| Baxi Roca Platinum 28/28F | Platinum | Contrasted |
| Baxi Roca Platinum 33/33F | Platinum | Contrasted |
| Baxi Roca Platinum 24 AF | Platinum | Contrasted |
| Baxi Roca Platinum 28 AF | Platinum | Contrasted |
| Baxi Roca Novanox Platinum 24/24F | Novanox Platinum | Contrasted |
| Baxi Roca Novadens 24/24F | Novadens | Contrasted |
| Baxi Roca Neodens 24/24F | Neodens | Contrasted |
| Baxi Roca Neodens 28/28F | Neodens | 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. 125569154 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 125569154. 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 125569154
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 and a generic electrical fault code appears on the screen.
Cause: This PCB is the main control: it manages ignition, safety, and timing. An internal fault causes an electrical lockout.
Check that stable 230V is reaching the PCB and that the ground connection is properly secured: a loose ground can cause the same symptom.
- 02
Try to ignite, you can hear the ignition attempt and it cuts off after a few seconds.
Cause: The control has a maximum safety time to confirm the ignition; if it does not receive the signal in time, it cuts off the gas.
Check the ignition/ionization electrode and its wiring before replacing the PCB: a dirty electrode can cause the same fault.
- 03
The controls do not accept temperature changes or reset themselves after a while.
Cause: The setpoint parameters are stored and managed in this control board.
Check if the fault persists after a complete power reset before assuming that the PCB does not retain the settings.
- 04
The boiler turns off by itself during operation, without prior warning.
Cause: An intermittent fault in the main control can cut off the supply even if the other components are functioning properly.
Note if the cut coincides with the simultaneous use of domestic hot water and heating: it helps to distinguish a PCB fault from a temporary overload.
Fault codes Baxi Roca that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 55 | Uncalibrated PCB | The PCB has been replaced or has lost the calibration data for the gas valve; electronic calibration is pending. Verify by executing the automatic calibration function as indicated by Baxi and ensuring it completes without errors. |
| 83 | Communication problem between the boiler PCB and the operator unit | Communication bus fault in the PCB (transceiver/port) or in the wiring. Check continuity of the harness and service voltages (5/12 V) between PCB and panel; if the wiring and panel are correct, the cause is the PCB. |
| 135 | Internal error of the PCB | Self-diagnosis of the PCB detects an internal fault. Check power supply and connectors; if it persists after reset and with stable voltages, the solution is to replace the PCB. |
| 151 | Anomaly inside the boiler control board | The PCB reports a general internal fault (hardware/firmware). Check voltages and connections; if there are no external causes, 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 125569154 PCB.
- Catalogue reference
- 125569154
- Uniclima internal SKU
- PLBA139
- 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.
- Siemens module model
- LMU34.210B349
- Siemens material code
- 56.8835.2
- voltage/frequency
- 230V~ 50Hz
- TSAmax
- 5s
- software version
- V02.10
- serial number/batch
- 0902050856
- auxiliary transformer
- brand 'era', CE, EN 10 VDE, ta 70°C/B
- flammability rating of the laminate
- VT-8 94V-0
Frequently asked questions about the PCB 125569154
Is this Siemens LMU34.210B349 PCB suitable for a Baxi Roca Novadens 24/24F?
Who manufactures the LMU34.210B349 PCB?
What fault does the replacement of this PCB resolve in a Baxi Roca Platinum?
What voltage does the PCB of the Novanox Platinum 24/24F operate at?
What software version does the LMU34.210B349 have?
Does this PCB work for a Baxi Roca Platinum 33/33F?
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