Display shows E07, indicating communication error between furnace control and Riello burner

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

Loose communication harness, Incorrect wiring between main board and burner, Faulty main control board, Faulty Riello burner control

Safety: Disconnect power before unplugging any connectors.

Steps:

Inspect harness: Check the multi-core cable between the furnace control and Riello burner. Reseat connectors at both ends.
Check for damage: Look for crushed, cut, or burned sections of the cable. Replace if damaged.
Verify wiring: Compare connections to the wiring diagram to ensure correct terminal mapping.

Persistent E07 usually requires board-level diagnosis by a technician.

Hard 4/5

Main Control Board

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