F.70 — No valid DSN in display and/or main board

What does F.70 mean?

The boiler is displaying an 'F.70' error because there is no valid Device Specific Number (DSN) set in the display or main board. This often occurs when both the display and main board have been replaced simultaneously without adjusting the DSN.

• Spare part failure: display and main board interchanged at same time.
• Device specific number not adjusted.

Click steps to track your progress.

1. 1

   This error usually requires a qualified technician to enter the device-specific number.

2. 2

   Access the second diagnostic level (requires password 17 at d.97) as per the manual.

3. 3

   Enter the correct appliance variant number at diagnostic number d.93 according to Table 11.1 in the manual.

4. 4

   Contact a qualified service technician if you are unsure how to perform this adjustment.