Skip to content
Appliance Error Codes

C5 Error on Rheem XE50T12ES45U0 Electric Water Heater — Fix Guide

Error C5 on Rheem : Lower element failure (electric models). Follow the troubleshooting steps below to diagnose and fix this electric-water-heater issue. ## What Error Code C5 Means on a Rheem XE50T12ES45U0 Error C5 on the XE50T12ES45U0 indicates the lower heating element has failed. The lower element handles the majority of water heating. Its failure causes very long recovery times or no hot water at all. When C5 appears, the Rheem electric water heater pauses normal operation to protect internal components from potential damage. Not every C5 fault requires a professional engineer — many are resolved through careful inspection and routine maintenance. Work through each diagnostic step below in sequence, starting with the simplest check, to identify the root cause efficiently before considering part replacement or arranging a service call. ## Symptoms - C5 fault code; very slow hot water recovery

  • Plenty of hot water initially, then quickly turns cold
  • Element may have burned out or calcium-encrusted
  • Lower portion of tank stays below setpoint temperature ## Common Causes - Lower element failure (electric models) ## Tools You May Need - Multimeter
  • Element wrench
  • Garden hose ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Turn off the circuit breaker for the water heater. | Done — continue to step 2 if the issue persists. | | 2 | Connect a garden hose to the drain valve; shut off the cold supply and fully drain the tank. | Done — continue to step 3 if the issue persists. | | 3 | Remove the lower access panel and disconnect the element wires. | Done — continue to step 4 if the issue persists. | | 4 | Measure resistance on the lower element — a reading of infinity (open) indicates failure. | Done — continue to step 5 if the issue persists. | | 5 | Unscrew the element with an element wrench, replace with a matched element, and refill the tank before restoring power. | Done — if the fault remains, contact a qualified technician. | ## Safety Precautions Never energize the heating element while it is exposed to air — this immediately burns it out. Fill the tank completely before turning power on. ## Estimated Repair Time and Difficulty Most electric water heater error code C5 faults can be assessed and addressed in 30–90 minutes using the steps above. The diagnostic process requires only basic tools: a multimeter and standard screwdrivers cover the majority of checks described here. If a replacement part is required, allow 1–5 working days for delivery. A trained technician with access to the correct diagnostic equipment will typically resolve this type of fault within a single service visit. ## When to Call a Technician Contact a Rheem authorised service technician if: the fault persists after following all the steps above; if PCB-level or refrigerant-circuit work is required; or if you are not comfortable working with electrical or mechanical components. When calling, have the full model number, the error code displayed, and a brief description of any sounds or symptoms you noticed before the fault appeared — this helps the technician prepare the correct parts and tools. ## Frequently Asked Questions Q: Why do lower elements fail more often? The lower element is submerged at the bottom of the tank where sediment accumulates. Calcium and magnesium deposits coat the element, causing hot spots and premature burnout. Q: How can I prevent sediment-related element failure? Flush the water heater annually by draining 2–3 gallons through the drain valve. Replacing the anode rod every 3–5 years also reduces corrosion. ### Is it safe to keep using my Rheem with error C5? If error C5 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the electric-water-heater with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error C5 on a Rheem ? Repair costs for error C5 on the Rheem electric-water-heater depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Rheem-authorized service provider for an accurate estimate based on your specific situation. ### What does error code C5 mean on a Rheem electric-water-heater? Error code C5 on Rheem electric-water-heater models indicates Lower element failure (electric models). This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue. ### Is it safe to keep using my Rheem with error C5? If error C5 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the electric-water-heater with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error C5 on a Rheem ? Repair costs for error C5 on the Rheem electric-water-heater depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Rheem-authorized service provider for an accurate estimate based on your specific situation. ### What does error code C5 mean on a Rheem electric-water-heater? Error code C5 on Rheem electric-water-heater models indicates Lower element failure (electric models). This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.