Hoval
No Power / Electrical Supply Fault
Boiler does not start at all, no display or lights
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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.
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Possible Causes
Blown external fuse, Tripped circuit breaker, Faulty boiler on/off switch, Internal fuse on Hoval PCB blown
How to Fix / Troubleshooting
Safety: Electrical work must comply with local regulations. If unsure, contact an electrician.
- Check mains supply: Verify that other electrical appliances on the same circuit work. Reset any tripped breakers and replace blown fuses with the correct rating.
- Boiler switch: Ensure the boiler's main power switch is in the ON position.
- Internal fuse: With power isolated, a technician can open the control compartment and check the internal fuses on the Hoval PCB. Replace only with identical types and ratings.
- If fuses blow again immediately, there is likely a short circuit in the boiler (e.g., pump, fan, or PCB) that must be diagnosed professionally.
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Repair Difficulty
Medium
3/5
Required Part
Internal PCB Fuse / Power Supply Circuit
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