Anti-freezing control method of gas water heater

The invention discloses an anti-freezing control method of a gas water heater, which comprises the following steps: when judging that a current waterway of the gas water heater begins to be frozen, entering a circulating heating mode to realize a secondary anti-freezing mode, otherwise, only starting a water pump to perform low-power operation to realize an initial anti-freezing mode; the pipeline is fully heated after circulating heating of the gas water heater, then the pipeline is in the initial anti-freezing mode for a long time, the pipeline is not prone to entering the secondary anti-freezing mode again, the method is simple and reliable, and whether the current waterway starts to enter the icing state or not is intelligently judged according to different environments; therefore, the gas water heater is started to perform heating cycle work or the water pump is started to perform low-power operation according to the judgment result, so that the consumption of gas is effectively reduced. 本发明公开了一种燃气热水器的防冻