Riello Blower-Only Operation

Furnace blower runs but burner does not fire, air from vents is cool

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

No call for heat to burner, Open safety in burner circuit, Faulty Riello control box, Thermostat or control board fault

Safety: Turn off power before testing circuits.

Steps:

Verify call for heat: Confirm the furnace control is sending a start signal to the Riello burner (check voltage at burner terminals).
Check safeties: Ensure high limit, rollout, and door switches are closed.
Inspect burner control: If safeties and call signal are present but burner is idle, the Riello control box may be faulty.

Hard 4/5

Riello Burner Control Box

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