How to Fix / Troubleshooting

Safety first: Turn OFF power and allow the unit to cool. Close the cold water supply and relieve pressure before draining.

Steps:

1. Drain and flush tank (storage models): Connect a hose to the drain valve, open a hot tap, and drain the tank. Briefly open the cold supply to stir up sediment, then drain again until clear.
2. Descale heat exchanger (tankless models): Use service valves, a pump, and a descaling solution to circulate through the heat exchanger per Electrolux instructions.
3. Inspect heating element: Remove the element and clean or replace if heavily scaled.
4. Consider water treatment: Install a water softener or anti-scale device if you have very hard water.

Result: Proper descaling should reduce or eliminate popping and rumbling noises.

Water heater makes popping or rumbling noises during heating

Possible Causes