Viessmann D7 Fault Burner Control Unit +352 20 60 22 22 Webe
Viessmann D7 fault (Vitodens 100, 200, 333): burner control unit LMU faulty. Temporary reset possible. Viessmann heating engineer Luxembourg 24/7.
Error code D7 on a Viessmann boiler (Vitodens 100-W, 200-W or 333-F) indicates a fault with the burner control unit (LMU) — the electronic brain that manages ignition and flame regulation.
A reset can temporarily restart the boiler. If D7 reappears within 24-48 hours, the LMU is faulty. Forcing repeated resets can damage other electronic components.
LMU replacement requires precise diagnosis of the exact Vitodens model. Precise quote before repair.
- On-site D7 fault diagnosis
- LMU replacement Vitodens 100 / 200 / 333
- Viessmann-trained technicians
- Parts available Luxembourg
- Quote before intervention
FAQ
Can I reset the Viessmann D7 fault myself?
Yes, via the reset button. If D7 returns within 24-48 hours, the LMU is faulty and must be replaced by a professional.
Is the D7 fault the same on Vitodens 100 and 200?
Yes, D7 indicates the same type of fault (LMU) across the Vitodens range. The replacement part differs by exact model.
How much does Viessmann LMU replacement cost?
The price is assessed on site based on the situation. A precise quote is provided before any repair. No surprises.
How long does a Viessmann LMU last?
An LMU typically lasts 10-15 years. Failure is often progressive — increasingly frequent resets before complete failure.
Does Weber & Fils repair Viessmann Vitodens boilers?
Yes. Weber & Fils works on the entire Vitodens range (100, 200, 333) and Vitopend in the Grand Duchy. Call +352 20 60 22 22.