LarryBest Posted December 4, 2021 Report Share Posted December 4, 2021 While my filter pump runs but the Hayward furnace is off a considerable rumbling noise is heard. The noise seems to originate where the pipes enter and exit the furnace. It is not steam as the heater is off. Bad diverter thermostat? Some other problem? Just an annoyance or needs to be fixed? Quote Link to comment Share on other sites More sharing options...
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