他们应该保修,让他们来看,不行换
http://www.rheem.com.au/TroubleshootingGuide
Not enough hot water (or no hot water)?
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Is the electricity switched on?
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Check the isolating switch (typically located at the switchboard) and next to the water heater (if installed) are both turned on
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Check the fuse marked “HOT WATER” or “WATER HEATER” at the switchboard
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Check the power cord is plugged in (if applicable) and is turned on