Boiler displays E19; may indicate fan communication or PWM error; fan may run at fixed speed only

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

Damaged fan control wiring, Incorrect fan replacement part, Faulty control board fan driver, Electrical noise on control lines

Safety: Disconnect power before handling wiring or the fan assembly.

Verify correct part: Ensure the installed combustion fan is the correct NTI part number for your model.
Inspect harness: Check the multi‑wire harness between the fan and control board for pin damage, loose connectors, or abrasion.
Secure routing: Keep fan control wires away from high‑voltage lines to reduce electrical noise.
Board vs fan: A technician should test the control signal output and fan response. Replace the fan or control board as indicated by testing.

Hard 4/5

Combustion Fan Assembly

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