Pentair Master Temp 400 banging and knocking Fix
Pentair Master Temp 400 banging and knocking due to faulty thermostat 77707-0119 x 12 O ring 77707-0001 x 1 Bypass valve 77707-0010 x 1 Thermal Regulator Kit 42001-0060S x 1 Water Pressure Switch 42001-0063S x 1 High Limit Switch 42001-0053S x 1 Thermistor 42001-0061S x 1 Air Flow Switch 42002-0025S x 1 Gas Shut Off Switch Good to change while you are at it is the Ignitor Kit 77707-0054 if any of the heat exchanger tubes are badly corroded it means a new heat exchanger kit which is expensive but still better than a new heater
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Pentair mastertemp heater making knocking noise. Bypass assembly replacement.
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