First of all, check whether the gas supply is normal. Secondly, see if the battery is dead. If it is, it will be normal as long as the battery is replaced. However, when changing the battery, you should see the direction clearly. If you make a mistake, there will still be no response. Finally, if it doesn't work, it depends on whether the gas supply channel is blocked, and it can be dredged (cleaned). In addition, check the air supply valve (near the gas meter, some have leak-proof devices, which will automatically close in case of situation, just open it). If these methods can't be solved, please ask professional maintenance personnel to have a look, and they will certainly be able to handle it.