1 power on self-test
2 time indication
3 preset of water temperature
4 preset of water temperature
5 water temperature indication
6. Water shortage alarming
7. Water refill in shortage
8. temperature-control water refill
9. Manual water refill
10 manual heating
11 twice timing water refill
12. Compulsory water refill
13. Water refill under low hydraulic pressure
14 automatic pressurization
15 thermal retardation of pipeline
16. Automatic overflow proof
17 automatic pressurization
18 water quality setting
19 pipeline cycle
20 dry burning proof
21 constant temperatures
22 temperature difference cycle