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When you hear the sound of a toad stopped breathing, then do not panic. The sound can be a combination of noises. It can be a clanging sound as your toaster and any other appliance that are not properly vented or opened. Sometimes it can be a whistling sound or a clicking sound that happens as the gas is released and burns out.Even though the sounds can be loud, you should not panic. The sooner you call the emergency service company, the better chance you have of saving your home. The best thing to do is to keep all your appliances turned off and the heater at 100 percent. This will give you time to check everything. If you find that it is a blockage or the unit is not working, then you will need to shut off the gas.