Furnace shows E19 and stops; may be associated with pump or fan speed feedback.

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

Faulty modulating pump, Faulty fan speed sensor, Broken feedback wire, Control board failure

Safety: Disconnect power before working on internal components.

Visual inspection: Check the connectors on the modulating pump and fan for secure fit and signs of corrosion or overheating.
Check for obstructions: Ensure the pump and fan can rotate freely and are not blocked by debris.
Reset: Restore power and reset the furnace. If E19 recurs, a technician must test the pump/fan feedback signals and the control board.

Hard 4/5

Modulating Circulation Pump

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