E06 Error on AO-SMITH GPVT-50 300 Gas Water Heater — Fix Guide

Error E06 on ao-smith : Flue gas temperature sensor fault (gas models). Follow the troubleshooting steps below to diagnose and fix this gas-water-heater issue. ## What Error Code E06 Means on a ao-smith GPVT-50 300 Error E06 on the GPVT-50 300 gas water heater means the flue gas temperature sensor is detecting an abnormal reading. This sensor is a safety device that shuts down the unit if the flue becomes restricted, preventing CO buildup. When E06 appears, the ao-smith gas water heater pauses normal operation to protect internal components from potential damage. Not every E06 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 - E06 on display; unit will not fire

Flue vent may be obstructed or incorrectly pitched
Sensor connector may be corroded
Status LED blinks 6 times ## Common Causes - Flue gas temperature sensor fault (gas models) ## Tools You May Need - Flashlight
Multimeter
Screwdrivers ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Inspect the flue vent pipe from the water heater to the exterior for bird nests, debris, or collapsed sections. | Done — continue to step 2 if the issue persists. | | 2 | Verify horizontal vent sections slope upward toward the exterior (1/4 in./foot minimum). | Done — continue to step 3 if the issue persists. | | 3 | Inspect the flue sensor connector on the burner assembly for corrosion. | Done — continue to step 4 if the issue persists. | | 4 | Measure flue sensor resistance; compare to the service manual specification at current ambient temperature. | Done — continue to step 5 if the issue persists. | | 5 | If the vent is clear and sensor reads correctly, the control board flue sensor input circuit may be faulty. | Done — if the fault remains, contact a qualified technician. | ## Safety Precautions Install CO detectors near all gas appliances. Never operate a gas water heater with a blocked flue. ## Estimated Repair Time and Difficulty Most gas water heater error code E06 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 ao-smith 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 E06 dangerous to ignore? Yes — this sensor protects against CO poisoning. Do not bypass or ignore E06. Ensure flue venting is completely clear before resuming operation. ### Is it safe to keep using my ao-smith with error E06? If error E06 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 gas-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 E06 on a ao-smith ? Repair costs for error E06 on the ao-smith gas-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 ao-smith-authorized service provider for an accurate estimate based on your specific situation. ### What does error code E06 mean on a ao-smith gas-water-heater? Error code E06 on ao-smith gas-water-heater models indicates Flue gas temperature sensor fault (gas 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 ao-smith with error E06? If error E06 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 gas-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 E06 on a ao-smith ? Repair costs for error E06 on the ao-smith gas-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 ao-smith-authorized service provider for an accurate estimate based on your specific situation. ### What does error code E06 mean on a ao-smith gas-water-heater? Error code E06 on ao-smith gas-water-heater models indicates Flue gas temperature sensor fault (gas 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.