Furnace shows E16; may occur intermittently during operation.

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

Seized pump rotor, Air-locked pump, Electrical failure in pump motor, Faulty pump relay on PCB

Safety: Isolate power and allow the system to cool before touching the pump.

Bleed the pump: If the pump has a bleed screw, open it slightly to release trapped air until water flows steadily.
Free the rotor: Some pumps allow access to the rotor with a screwdriver. Gently turn the rotor to free it if stuck.
Check electrical connection: Ensure the pump plug is fully inserted and the cable is not damaged.
Restart: Restore power and call for heat. If E16 persists, the pump or control board may need replacement.

Medium 3/5

Circulation Pump

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