Refurbished Vaillant PCBs (control boards)

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. Replacement requires first confirming the fault of the part through technical diagnosis, even when the control board fails and the boiler stops functioning normally.

Type of part: PCBs (control boards)
Status: Refurbished
Catalogue reference: 0020034604
Warranty: 1 year

VAT included Stock · 1 unit

Compatibility

Vaillant 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.

Guide

How to check if ref. 0020034604 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 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.

Diagnosis and fault codes

Symptoms that require diagnosis on the PCB 0020034604

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.

Technical data

Data sheet for the Vaillant 0020034604 PCB.

Catalogue reference: 0020034604
Uniclima internal SKU: DVMI32R3
Brand: Vaillant
Type of part: PCBs (control boards)
Units in stock: 1 unit
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.

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

Documentation

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

Frequently asked questions about the PCB 0020034604

Is this PCB original from Vaillant for a boiler from the VMI range?

Yes, the label identifies the PCB as Vaillant, reference 0020034604, and the VMI range is on the list of compatible boilers.

Does the Elmos chip on this PCB mean that it is not a Vaillant PCB?

No; the Elmos 411018 chip is the main integrated circuit, manufactured by Elmos Semiconductor, but the complete PCB is manufactured by Vaillant.

What supply voltage does the PCB of the VMI range use?

230 V, with a control circuit at 21 V.

What fuse does the PCB 0020034604 use?

T1.25 A, according to the reading on the label, which is partially legible.

When should this PCB be replaced in a VMI boiler?

The technical diagnosis must confirm that it is necessary to replace it, even when the control board fails and the boiler stops functioning normally.

Does the same PCB work for the models VMI 282-7 R3 and VMI 280-7 R3?

Yes, both models are on the list of boilers compatible with this PCB, reference 0020034604.

Spare parts related to Vaillant VMI

Entrega calculada por destino Delivery time shown at checkout

1-year warranty reviewed and tested

14-day return uninstalled parts

Technical support we verify your model

Vaillant Control PCB VM/VMI/VU/VUI/VUW/VMW - Ref. 0020034604