Burner locks out with code indicating photocell short circuit or sensor failure

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

Shorted photocell, Damaged photocell wiring, Moisture in sensor connector, Control box flame amplifier failure

Safety: Disconnect power before handling the sensor or wiring.

Steps:

Inspect sensor and cable: Remove the Riello photocell. Check for cracks, burn marks, or oil contamination. Inspect the cable for cuts or crushed sections.
Dry connectors: If moisture is present, dry the connector and surrounding area thoroughly. Correct any water leak sources.
Replace photocell: Install a new Riello OEM photocell if there is any doubt about the old one.

If A15 persists with a new sensor and good wiring, the control box is likely defective.

Medium 3/5

Riello Photocell Flame Sensor

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