Vaillant PCB VMW ES 346/3-5 Ref. 0020092478
When you turn on the tap or start the heating, the Vaillant VMW ES 346/3-5 PCB controls the ignition, the modulation of the burner, and the pump of your boiler. If this part fails, you will notice that the boiler does not start, locks out, or operates erratically, potentially displaying fault codes such as F.61, F.62, F.63, F.64, or F.65. It is compatible with models from the ecoTEC plus VMW and ecoTEC plus VM ranges, such as the VMW 296/3-5 or the VM 246/3-5, among others. It is recommended to replace it when the boiler shows these fault symptoms.
VAT included
Consult via WhatsAppVaillant boilers compatible with reference 0020092478
PCB with reference 0020092478. 11 verified compatibilities: VMW 296/3-5 and VMW 296/3-5 R3.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Vaillant VMW 296/3-5 | ecoTEC plus VMW (combi) | Contrasted |
| Vaillant VMW 296/3-5 R3 | ecoTEC plus VMW (combi) | Contrasted |
| Vaillant VMW 296/3-5 R5 | ecoTEC plus VMW (combi) | Contrasted |
| Vaillant VMW 346/3-5 | ecoTEC plus VMW (combi) | Contrasted |
| Vaillant VMW 346/3-5 R3 | ecoTEC plus VMW (combi) | Contrasted |
| Vaillant VMW 346/3-5 R5 | ecoTEC plus VMW (combi) | Contrasted |
| Vaillant VM 246/3-5 | ecoTEC plus VM (heating only) | Contrasted |
| Vaillant VM 246/3-5 R3 | ecoTEC plus VM (heating only) | Contrasted |
| Vaillant VM 376/3-5 | ecoTEC plus VM (heating only) | Contrasted |
| Vaillant VM 376/3-5 R3 | ecoTEC plus VM (heating only) | Contrasted |
| Vaillant VM 376/3-5 R5 | ecoTEC plus VM (heating only) | 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. 0020092478 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 0020092478. 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 and faults that the PCB 0020092478 resolves.
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 shows no signs of life.
Cause: The PCB does not manage the ignition correctly, so the startup cycle does not begin.
Check that power is reaching the boiler and that the main switch is in the correct position before ruling out the PCB.
- 02
A fault code related to the PCB (control board) appears on the screen.
Cause: The electronics detect an internal fault and display it as a fault code to lock the boiler for safety.
Note the exact code and consult the boiler manual: some PCB codes distinguish between sensor fault and electronic fault.
- 03
The thermostat or the boiler control is unable to turn the unit on or change the temperature.
Cause: If the PCB loses communication with the controls, it does not execute the commands even if they arrive correctly.
Check the batteries and connection of the wireless thermostat, if there is one, before assuming it is the PCB.
- 04
The boiler intermittently locks out without a clear pattern.
Cause: A specific fault in the control board can cause random lockouts without any visible mechanical cause.
Keep a record of when it locks up (cold start, after domestic hot water, etc.) to distinguish a PCB fault from a sensor fault.
Fault codes from Vaillant that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.61 | Gas valve activation error | The driver/relay of the PCB does not activate the gas valve when there is a demand. Check the voltage at the terminals of the valve during the request; if the wiring and valve are correct and no stable command is received, the PCB is defective. |
| F.62 | Gas valve disconnection delay | The output from the PCB to the valve remains stuck or leaking (relay/power stage), keeping the valve energized after shutdown. Check that the voltage to the valve drops immediately when the flame ceases; if the voltage persists and the valve closes when manually de-energized, the PCB is the cause. |
| F.63 | Fault: EEPROM | Corruption/invalid reading of the EEPROM memory in the PCB. Check retry and power supply stability; if the fault persists, reprogram if applicable or replace the PCB. |
| F.64 | Electronic fault / NTC | Fault in the measurement circuit on the PCB interpreting a short circuit in the NTC even when correct. Check NTC resistances in the sensor and in the board connector; if readings are correct and the warning persists, the fault is in the analog input of the PCB. |
| F.65 | Fault: PCB temperature | The PCB detects internal overtemperature or its thermal sensor is damaged. Check for external thermal influence and ventilation; if the ambient temperature is normal and the issue persists, the electronics/PCB is faulty. |
| F.67 | Fault: electronics/flame | Fault in the flame evaluation electronics of the PCB (implausible ionization signal). Check electrode/cable and ionization current; if they are correct and still implausible, the detection stage in the PCB is faulty. |
| F.70 | Invalid appliance code (DSN) | Display and PCB have been replaced without reprogramming the DSN/coding, or the power coding of the board does not match. Check/adjust DSN in service menu and coding resistor; if not possible, install the correct PCB and parameterize. |
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 Vaillant PCB 0020092478.
- Catalogue reference
- 0020092478
- Brand
- Vaillant
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Boiler model identified
- Vaillant VMW ES 346/3-5 (also compatible with VMW 296/3-5 and VM 376/3-5)
- Factory reference
- 0020092478
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Vaillant VMW 346/3-5 Manual (PDF)Document © Vaillant, provided as a technical reference.
Frequently asked questions about the PCB 0020092478
Is the reference 0020092478 the correct one for my Vaillant VMW ES 346/3-5?
When should this PCB of the VC 246/3-5 be replaced?
Does this PCB Ref. 0020092478 also work for the Vaillant VM 376/3-5 R3?
Spare parts related to Vaillant ecoTEC plus VMW (combi)
