Error 28 — Flue NTC heat exchanger sensor fault

What does 28 mean?

Error code 28 indicates a fault with the Flue NTC (Negative Temperature Coefficient) heat exchanger sensor. This sensor monitors the temperature within the flue system.

• Loose wiring harness connection at the flue high limit sensor.
• Loose wiring harness connection at the control board.
• Short circuit within the wiring harness.

Click steps to track your progress.

1. 1

   Check the wiring harness connections at the flue high limit sensor for any loose connections.

2. 2

   Inspect the wiring harness connections at the main control board for secure contact.

3. 3

   Examine the wiring harness for any signs of a short circuit that could be causing the fault.