Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater ELEMENT LED ON Error Fix: Heating Elements Active — Normal

Error code ELEMENT LED ON on the Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater means: Heating Elements Active — Normal. Each heating element inside the RTEX-13 has a corresponding LED indicator on the front panel. When an LED is illuminated, that element is actively heating the water passing through the unit. Multiple LEDs lit simultaneously indicate multiple elements are firing to meet the flow demand. This is completely normal during hot water usage. The RTEX-13 has two heating elements and two LED indicators. Both LEDs will be on during higher flow rates.

The most successful fix is "Confirm Normal Operation by Observing Element LEDs During Use" (easy difficulty, ~10 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

This error is rated info severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Confirm Normal Operation by Observing Element LEDs During Use") is rated easy difficulty and takes about 10 minutes. Tools needed: .

DIY cost: $0. Professional repair typically costs $0. Many homeowners save money by trying the top-ranked community fix first.

The Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater has 4 other known error codes, including: DISPLAY DASHES (Temperature Sensor Error), ELEMENT LED OFF (Elements Not Firing — No Demand or No Power), LOW TEMP OUTPUT (Insufficient Temperature Rise — Unit Undersized), NO DISPLAY (No Power to Unit — Display Dark).