When the red "Heating" light stays on longer than usual, or final rinse temperatures drop.
Hot water kills bacteria—but only if the heater is working. Keep your Ecotemp 12 descaled and your dishes sanitary. Disclaimer: This article is a summary for educational purposes. Always refer to the official Ecolab Ecotemp 12 Installation and Operation Manual provided with your specific serial number unit before performing any electrical or plumbing work. Ecolab Ecotemp 12 Manual
| Light Status | Problem | Solution | | :--- | :--- | :--- | | | No power | Check breaker, disconnect switch, and fuses. | | Red "Heating" light stays on constantly | Failed thermostat or stuck contactor | Replace thermostat. Do not run—water will boil and blow the relief valve. | | Green power light on, but water is cold | Burnt heating element | Check ohms across the element terminals (Expect ~10-15 ohms for 12kW). Replace element. | | Relief valve dripping water | Thermal expansion or failed check valve | Install expansion tank. If valve leaks when cold, replace the relief valve. | | Unit cycles on/off rapidly | Low water flow or sediment buildup | Descale the unit (see below). | Critical Maintenance: Descaling (Deliming) Hard water scale is the #1 killer of the Ecotemp 12. Scale acts as an insulator, causing the heating element to overheat and crack. When the red "Heating" light stays on longer