State electric water heater: no hot water at all; no electronic display or codes.

Safety: Always turn off the breaker and verify power is off before removing access panels.

• Check breaker: Inspect the water heater breaker in the panel. Reset if tripped. If it trips again, do not reset repeatedly; investigate cause.
• Inspect wiring: Remove the upper access panel and verify the supply wires are tight at the junction box and thermostat.
• Reset ECO: Press the red reset button on the upper thermostat. If it clicks, it was tripped.
• Test thermostat: Use a multimeter to verify continuity through the upper thermostat when calling for heat. Replace if open.