F87 Fault — Electrodes not connected or short circuit

What does F87 mean?

The boiler's electrodes are either not connected, connected incorrectly, or there is a short circuit in their cable harness.

• Electrodes not connected
• Electrodes connected incorrectly
• Short circuit in the cable harness

Click steps to track your progress.

1. 1

   Check that the electrodes are securely and correctly connected.

2. 2

   Inspect the cable harness for the electrodes for any signs of damage or short circuits.

3. 3

   If connections appear correct, a technician should investigate for internal short circuits or electrode issues.