83...87 — Communication problem between boiler board and control unit

What does 83...87 mean?

There is an issue with the communication link between the boiler's internal electronic board and its external control unit (like an ambient unit or thermostat).

• Probable short circuit on wiring
• Faulty wiring between the Ambient Unit and the electronic board
• Issue with the RF link (if a wireless control unit is used)

Click steps to track your progress.

1. 1

   Press and hold down the Reset button for 2 seconds to try clearing the fault.

2. 2

   Ensure your external control unit (thermostat) is properly powered and communicating (check its display for errors).

3. 3

   If the fault persists, contact an Authorised Service Centre to check the wiring or RF link.