Weishaupt Short cycling

Furnace short cycles, turning on and off frequently without reaching set temperature

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

Oversized burner, Incorrect thermostat placement, Dirty flame sensor causing nuisance shutdown, Blocked heat exchanger or poor airflow

Safety: Frequent cycling can stress components; address promptly.

Steps:

Thermostat location: Ensure the room thermostat is not near heat sources, drafts, or direct sunlight. Relocation may be needed.
Airflow: Replace air filters and ensure supply/return vents are open.
Flame sensor cleaning: Have the ionization electrode or UV sensor cleaned as part of maintenance to prevent nuisance flame loss detection.

Persistent short cycling often requires a professional to evaluate burner sizing, control settings, and heat exchanger condition.

Medium 3/5

Ionization Electrode

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