Why is the hotel water heater not hot?

The reason why the hot water of the water heater is not hot If the pipeline of the gas water heater is blocked during use, the gas will not flow smoothly. At this time, the water heater will not be able to ignite normally, which will eventually lead to the failure of the linkage switch of water vapor when there is no hot water, resulting in the water of the water heater not being hot. Scale or carbon deposit appears in the gas filter screen, pressure reducing valve and heat exchange copper tube of the water heater.