Bosch Insufficient Water Flow

Furnace shows P2; unit may overheat or shut down

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

Closed valves in heating circuit, Blocked system filter, Air in radiators, Undersized or failing pump

Safety: Allow the system to cool.

Valve positions: Confirm all isolation valves near the boiler and on main circuits are fully open.
Clean filters: If a system filter or strainer is installed, isolate and clean it.
Bleed radiators: Release trapped air starting from the lowest to highest radiators.

If P2 persists, a technician should check pump sizing and system design.

Medium 3/5

Circulation Pump

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