Boiler displays communication error between main PCB and burner control or remote controller

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 or damaged communication cable, Faulty burner control module, Faulty main control PCB, Incorrect wiring after service

Safety: Isolate power before accessing control compartments.

Check plugs and cables: Inspect the low-voltage communication harness between the Riello burner control and the boiler PCB or remote controller. Reseat connectors.
Look for damage: Check for crushed, pinched, or rodent-damaged cables.
Power cycle: Turn off power for 30 seconds, then restore. Sometimes a reset clears transient communication errors.
Professional diagnosis: If the fault persists, a technician should test the burner control module and main PCB and replace the defective unit.

Hard 4/5

Main Control PCB

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