Weishaupt Recycling on flame failure

Furnace starts but shuts down after a few seconds, then retries repeatedly

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

Weak flame signal, Dirty flame sensor, Incorrect gas pressure, Blocked burner head

Safety: Repeated failed ignition attempts can lead to unburned fuel accumulation. If lockouts persist, stop resetting and call a technician.

Steps:

Clean flame sensor: Remove and clean the ionization electrode or UV sensor as described earlier.
Air intake and flue: Ensure both are clear to allow stable combustion.
Observe flame: If possible, observe the flame through the inspection window. A small or unstable flame indicates a combustion issue requiring professional adjustment.

Hard 4/5

Ionization Electrode

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