Skip to main content
HomeMDHomeMD

NO DISPLAY

Rheem · Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater

Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater NO DISPLAY Error Fix: No Power to Unit — Display Dark

The digital temperature display and all LED indicators are completely dark. No power is reaching the unit. Check the 240VAC electrical supply: verify the circuit breaker is ON (RTEX-13 requires a dedicated 60-amp breaker), check for tripped GFCI if installed, inspect the wire connections at the unit terminal block for loose or burned wires. The RTEX units have no internal fuse — all overcurrent protection is provided by the circuit breaker at the electrical panel. If the breaker trips immediately upon resetting, there is a short circuit either in the wiring or in a heating element.

warning2 fixes available✨ Free fix available
Share:

Quick Answer

Error NO DISPLAY on the Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater means: No Power to Unit — Display Dark. The top-ranked community fix is “Inspect and Repair Wiring and Heating Element for Short Circuit” (medium difficulty, ~60 min, DIY cost: $10-$20). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · water heater

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many water heater repairs can be done safely at home, consider hiring a qualified technician if:

  • The repair involves electrical wiring, gas lines, or refrigerant
  • You've tried the top-ranked fix and the error persists
  • You smell gas, see sparking, or notice water leaking
  • The repair requires specialized tools you don't have
  • Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$300.

Other Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater Error Codes

DISPLAY DASHES

Temperature Sensor Error

2 fixes
ELEMENT LED OFF

Elements Not Firing — No Demand or No Power

2 fixes
ELEMENT LED ON

Heating Elements Active — Normal

2 fixes
LOW TEMP OUTPUT

Insufficient Temperature Rise — Unit Undersized

2 fixes

People Also Ask About Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater Error NO DISPLAY

What does error code NO DISPLAY mean on a Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater?
Error code NO DISPLAY on the Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater means: No Power to Unit — Display Dark. The digital temperature display and all LED indicators are completely dark. No power is reaching the unit. Check the 240VAC electrical supply: verify the circuit breaker is ON (RTEX-13 requires a dedicated 60-amp breaker), check for tripped GFCI if installed, inspect the wire connections at the unit terminal block for loose or burned wires. The RTEX units have no internal fuse — all overcurrent protection is provided by the circuit breaker at the electrical panel. If the breaker trips immediately upon resetting, there is a short circuit either in the wiring or in a heating element.
How do I fix error code NO DISPLAY on my Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater?
The most successful fix is "Inspect and Repair Wiring and Heating Element for Short Circuit" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.
Is error code NO DISPLAY on a Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater serious?
This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.
Can I fix Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater error NO DISPLAY myself?
Yes — the top-ranked community fix ("Inspect and Repair Wiring and Heating Element for Short Circuit") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Wire stripper, Voltage tester.
How much does it cost to repair Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater error NO DISPLAY?
DIY cost: $10-$20. Professional repair typically costs $150-$300. Many homeowners save money by trying the top-ranked community fix first.
What other error codes does the Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater have?
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), ELEMENT LED ON (Heating Elements Active — Normal), LOW TEMP OUTPUT (Insufficient Temperature Rise — Unit Undersized).
What other error codes does the Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater have?

The Rheem Rheem RTEX-13 13kW Point-of-Use Electric Tankless Water Heater has 4 other known error codes:

Ad Space — banner

Replace ADSENSE_PUBLISHER_ID in AdUnit.tsx