Generation 2: (SG1200WIFI, SG2000LED, CO2200LEDMAX)
Turn off the heater.
Hold the button with the 3 wavy lines / WiFi button / temperature wheel while turning the heater back on.
When you see the display reset (the LEDs on the display will blink), you can release both buttons.
The heater will start with the default temperature set to 22°C.
Generation 3: (CO1200WIFI3, CO1500MAXWIFI3)
Turn off the heater.
Turn the heater on. Immediately after this, press and hold the gear/settings button.
Release the button when "FR" appears on the display. First, you will see "CH(L)", then "CO(L)", and finally "FR".
The heater will then count up and stop at 22°C. Your heater is now reset.
Note:
The SG2000MEC and CO2200MECMAX models cannot be reset.