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"Without water, do not turn off the burner," winter temperature is too low, this failure is water - gas linkage valve failure caused. Water - gas is a gas water heater on linkage
The primary safety control device, its role is to ensure that only the water enters the water heater, the burner (or the main burner) to the ignition work; without water, the
Automatically and immediately turn off the burner. Water - There are many types of gas linkage, blast combustion heater control magnetic switch using water as a water - gas interlocks.