Set Appliance State:

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

This boiler has appliance specific numbers set
by parameters dF and dU from the display.
The numbers are shown on the data badge on the inside of
the boiler; boiler in picture has dF number 3 and dU number 1.
Check the dF and dU numbers using instructions below.
1. Press   and R buttons (press   first), display should alternate C & 0.
2. Press + until display alternates between C & 12.
3. Press   then press + until display alternates P & dF (after P31).
4. Press   so display alternates dF and a number, check it against
    boiler plate and use the + or - buttons to adjust if necessary.
5. Press   and repeat the previous step for dU then press   to confirm changes.
Note: This will reset appliance to factory settings, readjust individual parameters as necessary.