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Appliance Error Codes

HP06 Error on Rheem XE50T10HS45U0 Heat Pump Water Heater — Fix Guide

Error HP06 on Rheem : Water outlet thermistor (NTC2) fault. Follow the troubleshooting steps below to diagnose and fix this heat-pump-water-heater issue. ## What Error Code HP06 Means on a Rheem XE50T10HS45U0 Error HP06 on the XE50T10HS45U0 heat pump water heater indicates the tank water outlet thermistor NTC2 has an open or short circuit. This sensor provides accurate tank temperature for the heat pump control strategy. When HP06 appears, the Rheem heat pump water heater pauses normal operation to protect internal components from potential damage. Not every HP06 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 - HP06 on display

  • Water temperature may be incorrect
  • Heat pump may overheat or underheat the tank
  • Thermistor reading failure confirmed in diagnostics ## Common Causes - Water outlet thermistor (NTC2) fault ## Tools You May Need - Multimeter
  • Replacement NTC2 thermistor ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Power off the unit. | Done — continue to step 2 if the issue persists. | | 2 | Locate NTC2 — typically a probe on the hot water outlet pipe or in the upper tank well. | Done — continue to step 3 if the issue persists. | | 3 | Measure resistance at current water temperature; should match the specification table. | Done — continue to step 4 if the issue persists. | | 4 | Replace if reading is open or shorted. | Done — continue to step 5 if the issue persists. | | 5 | Power on and confirm HP06 is cleared. | Done — if the fault remains, contact a qualified technician. | ## Safety Precautions Shut off the cold water supply before accessing plumbing-related sensors to avoid water spillage. ## Estimated Repair Time and Difficulty Most heat pump water heater error code HP06 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: Is NTC2 the same as the upper tank thermostat? No — NTC2 is an electronic thermistor used by the heat pump control system. The thermostat is the mechanical switch that controls the resistance backup heating element. ### Is it safe to keep using my Rheem with error HP06? If error HP06 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 heat-pump-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 HP06 on a Rheem ? Repair costs for error HP06 on the Rheem heat-pump-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 HP06 mean on a Rheem heat-pump-water-heater? Error code HP06 on Rheem heat-pump-water-heater models indicates Water outlet thermistor (NTC2) fault. 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 HP06? If error HP06 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 heat-pump-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 HP06 on a Rheem ? Repair costs for error HP06 on the Rheem heat-pump-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 HP06 mean on a Rheem heat-pump-water-heater? Error code HP06 on Rheem heat-pump-water-heater models indicates Water outlet thermistor (NTC2) fault. 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.