Vaillant PCB VM/VMW/VMI Series 240-282 Ref. 0020034604
Control PCB for Vaillant VM, VMW, and VMI boilers, with reference 0020034604 and mounting variants (Baugr.) 712026/27/29/30. It includes a power terminal block, T1.25A fuse, and an Elmos 411018 chip identified as the flame control. It is replaced when the PCB fails and the boiler stops igniting or managing combustion.
VAT included
Consult via WhatsAppVaillant 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 tries to ignite, sparks, but immediately locks out without detecting a flame.
Cause: The flame control circuit on the PCB may fail and not recognize ionization even though the burner is on.
Clean and inspect the ionization electrode and its cable before replacing the PCB; a poor flame signal gives the same fault.
- 02
The boiler does not start at any time, as if it is not receiving the command to turn on.
Cause: A general fault in the control board leaves the entire ignition cycle unmanageable.
Check that the thermostat is calling for heat and that power is reaching the PCB before replacing it.
- 03
The T1.25A fuse appears blown again shortly after replacing it.
Cause: A fuse that repeatedly blows on the PCB usually indicates a short circuit downstream, not just a worn-out fuse.
Before installing a new PCB, check the pump, fan, and gas valve for any short circuit that might still be blowing the fuse.
- 04
The boiler does not respond to any commands from the remote or the buttons on the unit itself.
Cause: If the microcontroller on the PCB stops working, neither the physical controls nor the remote control have any effect.
Try resetting the boiler by cutting the power for 1 minute; if it still does not respond, the fault is usually in the PCB.
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
- 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.
- Reference (Vaillant code)
- 0020034604
- Mounting Variants (Baugr.)
- 712026/27/29/30
- Terminal block label
- 230V (confirmed, not '230W')
- Fuse
- T1.25A
- Main chip
- Elmos 411018 (also marked as 734498 / 78A 3060A), identified as flame control
- Relay/transformer module
- E130-X6/7048V127, date 1303, 230V~ 50-60Hz
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
What reference is printed on the PCB of the Vaillant VM 242-5?
Is this PCB compatible with any model in the VMW range?
What is the difference between this PCB and another with the same reference 0020034604 but a different Baugr.?
What chip controls the ignition on the PCB of the VMI 282-7?
What fuse is soldered on this PCB of the VMW 242/2-3?
How many models are compatible with the PCB Vaillant 0020034604?
Spare parts related to Vaillant VMW (combi turboTEC/turboMAX, wall-mounted combi)
