Vaillant
Overheating Electrical Component / Insulation Damage
Water heater emits a burning smell or plastic smell during operation
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Overheating pump or fan motor, Loose electrical connection causing arcing, Foreign object touching hot components, PCB component overheating
How to Fix / Troubleshooting
Safety: Immediately switch off power and gas if a burning smell is detected. Do not continue to operate the appliance.
- Visual inspection: After cooling, remove the cover and inspect for discoloured wiring, melted insulation, or burnt PCB areas.
- Check moving parts: Ensure the fan and pump rotate freely and are not obstructed. Replace any motor that shows signs of overheating or seizure.
- Tighten connections: Check terminal blocks and earth connections for looseness and signs of arcing. Tighten or replace as needed.
- Replace damaged components: Any burnt wiring, connectors, or PCB must be replaced. Do not attempt to repair burnt PCBs.
- Test safely: After repairs, restore power and monitor closely for any recurrence of smell.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements