Cistern sucks shrivelled to be out of shape, water heater cannot be used normally
Reason: The vent-pipe of cistern jams, the air inside cistern and air not UniCom.
Settle way: Have in cistern of the canvass when installing water heater and vent-pipe without sundry; Cannot fall in the vent-pipe in using dirt, ice and snow or frozen; Change new water tank.
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