Riello Short Cycling

Furnace short cycles (turns on and off frequently) without reaching set temperature

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.

Possible Causes

Oversized burner firing rate, Dirty flame sensor causing nuisance trips, Faulty thermostat placement, Blocked filter or vents causing high limit trips

How to Fix / Troubleshooting

Safety: Turn off power before internal inspection.

Steps:

Replace filter and open vents: Restore proper airflow to prevent high limit trips.
Clean photocell: Ensure the Riello flame sensor is clean and properly seated.
Check thermostat location: Move away from heat sources or drafts if necessary (may require electrician/HVAC tech).

If short cycling continues, a technician should check firing rate and control settings.

Repair Difficulty

Medium 3/5

Required Part

Riello Photocell Flame Sensor

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