1. When the ultra-low water level is shut down, it is necessary to carry out the furnace test (press the button on the B3 board, it should be able to simulate the lack of water to stop the furnace), or discharge the sewage to check the function of the ultra-low water level shutdown.
2. The safety valve is manually opened once and the reset is rapid.
3. The burner control system and the electric eye should be inspected, and the photocell of the electric eye should be taken out by hand. The furnace should be stopped within 1 s; and the electric eye should be wiped.
4. The valve packing is filled or replaced; eliminate running leaks.
5. The bolts are tightened everywhere, especially the gas pipeline system, if necessary, leak detection.