Main Control PCB Vaillant VMW 240/2-3 R1 Ref. 0020034604
Main control PCB for Vaillant boilers VMW 240/2-3 R1 and equivalents (VUW 242/2-3 R1, Turbomax Pro 24E in UK nomenclature). It has 'Vaillant' printed on the silkscreen and the burner marks 21V and 230V. The reference 0020034604 is confirmed as a genuine Vaillant PCB by two independent external sources. It is replaced when the boiler's electronic control fails.
Vaillant boilers compatible with reference 0020034604
PCB with reference 0020034604. 14 verified compatibilities: VMW 240/2-3 and VMW 240/2-3 R1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Vaillant VMW 240/2-3 | VMW (mixed turboTEC/turboMAX, wall-hung mixed) | Contrasted |
| Vaillant VMW 240/2-3 R1 | VMW (mixed turboTEC/turboMAX, wall-hung mixed) | Contrasted |
| Vaillant VMW 242/2-3 R1 | VMW (mixed turboTEC/turboMAX, wall-hung mixed) | Contrasted |
| Vaillant VMW 242/2-3 R2 | VMW (mixed turboTEC/turboMAX, wall-hung mixed) | Contrasted |
| Vaillant VMW 242-5 | VMW (mixed turboTEC/turboMAX, wall-hung mixed) | Contrasted |
| Vaillant VMW 280/2-5 | VMW (mixed turboTEC/turboMAX, wall-hung mixed) | Contrasted |
| Vaillant VMW 282/2-5 | VMW (mixed turboTEC/turboMAX, wall-hung mixed) | Contrasted |
| Vaillant VM 240/2-5 | VM (heating only) | Contrasted |
| Vaillant VM 242/2-5 | VM (heating only) | Contrasted |
| Vaillant VM 280/2-5 | VM (heating only) | Contrasted |
| Vaillant VM 282/2-5 | VM (heating only) | Contrasted |
| Vaillant VM 202/2-5 | VM (heating only) | Contrasted |
| Vaillant VMI 280-7 | VMI (compact interior) | Contrasted |
| Vaillant VMI 282-7 | VMI (compact interior) | 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. 0020034604 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 0020034604. 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 0020034604 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 when the switch is turned on.
Cause: The PCB does not activate the microprocessor that controls the boiler.
Measure with a multimeter if there is 230V at the input of the PCB before replacing it.
- 02
A fault code appears indicating a communication issue with the remote control or the programmer clock.
Cause: The PCB manages communication with the accessories; if it fails, the control loses connection.
Check the communication wiring and its polarity before considering the PCB as the culprit.
- 03
The boiler locks out with different fault codes during the week.
Cause: The sensor management components on the PCB wear out and intermittently produce incorrect readings.
Note each code that appears; if the pattern is erratic, it is more likely that the fault lies with the PCB rather than a specific sensor.
- 04
The circulation pump does not start even though the boiler needs heat.
Cause: The output relay on the PCB that powers the pump may not be closing the contact.
Test if the pump starts when powered directly, to rule out that the problem is with it.
Fault codes from Vaillant that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.63 | EEPROM error: fault in the configuration memory of the boiler's electronics. | The EEPROM physically resides on this main PCB; if the memory becomes corrupted or fails, the cause is the board itself. Verify: after a reset, the code persists and, with correct connections and sensors, the fault reproduces; confirm replacement of the board. |
| F.64 | Electronics error / NTC: fault in the electronics or short circuit in the flow/return NTC sensors. | When a short circuit in the NTC is ruled out (by checking sensors and wiring with a multimeter), the fault in the electronics processing those signals points to this main PCB. Verify: NTC and connections are correct but the fault code persists after reset = defective PCB. |
| F.65 | Temperature error in the electronics: the PCB is overheating. | The temperature sensor of the electronics itself detects excess heat on the PCB; if an external heat source or lack of ventilation is ruled out, the origin is a defect in the PCB. Verify: normal environment/ventilation but the code repeats = faulty PCB. |
| F.61 | Fault in the regulation/activation of the gas valve: the electronics cannot control the gas valve. | The PCB is the one that controls the gas valve; with wiring to ground, short circuit, and the valve itself ruled out using a multimeter, the remaining documented cause is the PCB. Verify: wiring and valve coils are correct but the code persists = defective PCB (the PCB is one of the causes, not the only one). |
| F.62 | Gas valve error due to delayed shutdown: delayed disconnection of the gas valve detected. | The PCB manages the closing/timing of the valve and the electrode signal; with the valve and detection electrode ruled out, the control electronics defect points to this PCB. Verify: valve and electrode are correct but the code repeats = PCB (concurrent cause with valve/electrode). |
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 0020034604 PCB.
- Catalogue reference
- 0020034604
- Brand
- Vaillant
- 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
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- manufacturer
- Vaillant (printed on the control board itself; also confirmed)
- burner brands (screen printing)
- 21V, 230V
- reference
- 0020034604 (genuine Vaillant PCB, confirmed by 2 independent external sources)
- internal number Vaillant
- 1379974 (replaces the obsolete 1373760)
- EAN
- 4024074513828
- equivalence of denomination
- VMW 240/2-3 R1 (ES/continental) = VUW 242/2-3 R1 / Turbomax Pro 24E (UK) — same device, same PCB 0020034604
- The internal number Vaillant 1379974 replaces the obsolete 1373760: if your boiler has the old version installed, the spare part is the same.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Vaillant VMW 240/2-3 Manual (PDF)Document © Vaillant, provided as a technical reference.
Frequently asked questions about the PCB 0020034604
Is the PCB Ref. 0020034604 an original part from Vaillant?
Is this PCB suitable for my Vaillant Turbomax Pro 24 E boiler?
What is the internal number of Vaillant for this PCB and which one does it replace?
What fault of the Vaillant VMW 240/2-3 R1 does the replacement of this PCB solve?
What voltages are marked on the terminal block of this Vaillant PCB?
Spare parts related to Vaillant VMW (combi turboTEC/turboMAX, wall-mounted combi)
