Furnace display shows F0; unit may not respond to commands

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

Corrupted control firmware, Power surge damage, Moisture on PCB, Loose internal connectors

Safety: Disconnect power before opening the control compartment.

Visual inspection: Look for signs of water ingress, burnt components, or loose plugs on the main PCB. Dry any moisture and correct the source of leaks.
Reseat connectors: Carefully unplug and replug low-voltage connectors to ensure good contact.
Power reset: Leave power off for several minutes, then restore. If F0 returns immediately, the board is likely defective.

Control board replacement and configuration should be done by a Bosch-authorized technician.

Professional Required 5/5

Main Control Board

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