Vaillant Control PCB VM/VMI/VU/VUI/VUW/VMW - Ref. 0020034604
Vaillant control PCB, reference 0020034604. It is a proprietary board from the brand: the main chip is from Elmos Semiconductor, but it does not carry an external manufacturer (OEM) brand. It operates at 230 V, with a control circuit at 21 V and a T1.25 A fuse. It is replaced when the control board fails and the boiler stops functioning normally.
VAT included
Consult via WhatsAppVaillant boilers compatible with reference 0020034604
PCB with reference 0020034604. Five confirmed compatibilities: 280-7 and 280-7 R3.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Vaillant 280-7 | VMI | Contrasted |
| Vaillant 280-7 R3 | VMI | Contrasted |
| Vaillant 282-7 | VMI | Contrasted |
| Vaillant 282-7 R2 | VMI | Contrasted |
| Vaillant 282-7 R3 | VMI | 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 turn on and nothing appears on the display or indicators.
Cause: The PCB has lost internal power, usually because its fuse has blown.
Measure with a multimeter if 230 V is reaching the input of the PCB and check if the fuse is blown at a glance before replacing it.
- 02
The display shows a fault code that does not disappear even after turning the power off and on several times.
Cause: The PCB retains a persistent internal fault in its control electronics.
Write down the exact code and check it in the manual: some codes point to a sensor or an external valve, not the PCB.
- 03
The control knob or panel is not responding, although the boiler starts on its own in basic mode.
Cause: The communication circuit of the PCB with the control unit is faulty, while the rest of the electronics continue to function.
Check the wiring and the control connector before blaming the PCB: a loose cable gives the same symptom.
- 04
The boiler turns on, modulates poorly, or stops for no apparent reason and without a clear fault.
Cause: A relay or triac on the PCB intermittently fails when managing the burner or the pump.
Force a test or chimney sweep cycle from the control panel to see if the fault always repeats at the same point.
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.
- Supply voltage
- 230 V
- Control voltage (low voltage circuit)
- 21 V
- Main integrated circuit
- Elmos 411018 — manufacturer of the chip, not the complete PCB
- Secondary code on PCB
- 734498
- Baugruppe code (construction group)
- 712026/27/29/30
- Transformer
- 230V~ / 150V~ 4A / ~50-60Hz — date code 1303
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Vaillant Manual 282-7 (PDF)Document © Vaillant, provided as a technical reference.
Frequently asked questions about the PCB 0020034604
Is this PCB original from Vaillant for a boiler from the VMI range?
Does the Elmos chip on this PCB mean that it is not a Vaillant PCB?
What supply voltage does the PCB of the VMI range use?
What fuse does the PCB 0020034604 use?
When should this PCB be replaced in a VMI boiler?
Does the same PCB work for the models VMI 282-7 R3 and VMI 280-7 R3?
Spare parts related to Vaillant VMI
