Siemens PCB LMU34.210B149 For Baxi Roca Platinum 24/24F Ref. 125569154
When you open the tap or turn on the heating, the Siemens LMU34.210B149 PCB for Baxi Roca Platinum 24/24F Ref. 125569154 is responsible for controlling the ignition, burner modulation, and the boiler pump. If this part fails, you will notice that the boiler does not start, gets locked, or exhibits erratic operation. This board is compatible with models such as Platinum 24/24F, Platinum 28/28F, and Novadens 24/24F, among others. A technician must confirm through diagnosis whether it needs to be replaced if you experience operational issues or if faults such as 55, 83, 135, or 151 appear.
- 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 won't start, there is no ignition attempt.
Cause: The burner does not start because it does not receive or process the demand signal.
Check that 230V is reaching the PCB and that the fuse is not blown before replacing it.
- 02
The boiler attempts to ignite but locks out after a few seconds.
Cause: The system does not detect the flame signal within the safety time and cuts off the gas for protection.
Check the ionization electrode and its wiring to ensure they are clean and securely attached before replacing the PCB.
- 03
The control panel does not respond to any button presses.
Cause: A fault in the control module prevents communication between the control panel and the rest of the system.
Check the connectors between the PCB and the control panel to ensure they are not loose or corroded.
- 04
The boiler intermittently locks out with different fault codes.
Cause: An internal system fault disrupts the monitoring of the different phases of the ignition cycle.
Note the lock codes on several occasions; if they change unrelated to use, they indicate a problem with the PCB and not with a specific sensor.
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
- PLBA133
- Brand
- Baxi Roca
- Type of part
- PCBs (control boards)
- Units in stock
- 0 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.
- Manufacturer
- Siemens
- Code / model
- LMU34.210B149
- Siemens reference
- 56.8547.2
- Voltage
- 230V~ 50Hz
- Software version
- V02.11
- TSAmax
- 5s
Frequently asked questions about the PCB 125569154
What code does the Siemens PCB for the Baxi Roca Platinum 24/24F have?
What voltage does the LMU34.210B149 PCB operate at?
Is this LMU34.210B149 PCB suitable for the Baxi Roca Novanox Platinum 24/24F?
Is this PCB suitable for the Baxi Roca Platinum 33/33F?
What TSAmax parameter does the LMU34.210B149 PCB have?
Spare parts related to Baxi Roca Platinum
