a/2/1 (sub-code 8/1/6) — Heating Circuit Flow sensor Fault (Short/Interruption)

What does a/2/1 mean?

This locking fault means the heating circuit flow sensor has a short circuit, an interrupted connection, or is incorrectly connected or defective. The boiler cannot correctly factor in room temperature information, which affects heating optimization.

• Short circuit in the heating circuit flow sensor contacts.
• Interrupted connection to the heating circuit flow sensor.
• Incorrect installation or wiring of the sensor.
• Defective heating circuit flow sensor.

Click steps to track your progress.

1. 1

   Visually inspect the wiring and connections to the heating circuit flow sensor for damage or loose wires.

2. 2

   Ensure the sensor is connected correctly according to the installation manual.

3. 3

   If connections appear correct, contact a qualified technician to test or replace the sensor.