If you were able to use the hot water normally and it suddenly stopped, there is a possibility that the gas meter have cut the gas flow.

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Depending on the amount of gas used to heat the water, the gas meter may cut the gas flow, specially during the cold season in Autumn to Winter.

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The cut of the gas by the meter is not a malfunction. It is a safety function to avoid gas leaks.

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〈Common reasons the gas meter shuts off the gas〉

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・If the gas is used for too long.

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If the hot water is used for too long, the gas meter may consider as a potential gas leak and will shut the gas.

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・The amount of gas being used.

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If the gas meter detects a increasing amount of gas, it may consider as a potential gas leak and will shut the gas automatically.

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・Due to a tremor or shake.

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The security system may be activated by strong winds or a small tremor even if there is no actual risk.

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You can easily restore the connection by pressing a button on the gas meter.

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For the instructions, check the link 「How to reset the gas meter.」below.