Hoval Unstable operation / internal protection

Furnace starts but shuts down after a few seconds 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

Intermittent flame detection, Loose internal wiring, Over-sensitive safety thermostat, Control board fault

Safety: Repeated failed starts can be hazardous. Limit reset attempts.

Observe sequence: Watch the start-up through the sight glass to see if the flame is established and then lost.
Check connections: With power off, gently press all plug-in connectors on the control board, sensors, and gas valve to ensure good contact.
Ventilation and flue: Ensure adequate combustion air and a clear flue to prevent unstable flame.
Service call: If behaviour persists, a technician should check flame signal levels and control board operation.

Hard 4/5

Hoval Burner Control Module

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