just switched on my cascade on battery working fine but when i put it on 240v(house)it makes a really loud buzzing noise does anyone know why pls.it stll works but this buzzing sound.
Try switching your battery charger off, if the buzzing stops when the charger is off?, then the charger is faulty and giving out over 15 volts which is also cooking your battery!
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Topic: cascade water heater
