1. The gas pressure is too low, and the burner cannot be started;

2. The gas pressure is too high, which does not meet the pressure required for the burner to start;

3. The burner is damaged and cannot be started;

4. The gas boiler is short of water, and the boiler does not start due to chain reasons;

5. The gas boiler is overheated, and the boiler does not start due to interlocking reasons;

6. The gas boiler is overpressured, and the boiler does not start due to interlocking reasons;

7. The circulating water pump is damaged, and the boiler does not start due to interlocking reasons;

Minimum height of gas boiler chimney

Each new gas fired boiler room can only be set up with one chimney. The height of the chimney should be based on the total installed capacity of the boiler room, as specified in Table 4, and the chimneys of oil-fired and gas-fired boilers should not be less than 8 meters. When there is a building within a radius of 200m around the chimney of the newly built boiler room, the chimney should be more than 3m higher than the tallest building.