Hoval Unstable Flame / Early Shutdown

Boiler starts then shuts down after a few seconds, repeatedly, without showing an error code

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.

Possible Causes

Flame sensor marginal, Burner partially blocked, Gas pressure fluctuating, Fan speed control issue

Safety: Combustion issues must be handled by qualified personnel.

Clean ionisation electrode: Remove and clean the flame sensor tip. Ensure correct positioning in the flame.
Inspect burner: Check for debris or corrosion on the burner surface. Clean gently.
Check flue and air intake: Ensure they are unobstructed and correctly installed.
If the problem persists, a Hoval technician should perform combustion analysis and check gas and fan modulation.

Professional Required 5/5

Ionisation Electrode / Burner

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