Water heater indicator light is on but water remains lukewarm or cold.

Safety first: Switch off power at the breaker and verify with a multimeter. Water may still be hot—open a tap to check before working.

Steps:

• Access element terminals: Remove the lower cover to expose the element flange and wiring.
• Check continuity: Disconnect wires from the element and measure resistance across its terminals. An infinite reading indicates a failed element.
• Inspect for scale: If the element is heavily scaled, it may have overheated and failed. Plan to descale the tank.
• Replace element: Drain the tank below element level, remove the flange, and install a new Tesy heating element assembly with a new gasket. Tighten bolts evenly.
• Refill and test: Refill the tank fully, bleed air from hot taps, then restore power and confirm proper heating.