QAS740RMSS F2 Error Code | Haier Range Fault Guide

Error F2 on Haier QAS740RMSS: Oven temperature exceeded maximum safe threshold — runaway oven temperature dete. Follow the troubleshooting steps below to diagnose and fix this Range issue. ## What Is the F2 Error Code on the Haier QAS740RMSS? The F2 fault on the Haier QAS740RMSS — a 24-inch ENERGY STAR Electric Range with 2.9 cu. ft. convection oven, smoothtop radiant cooktop, steam clean, and modular backguard — means: Oven temperature exceeded maximum safe threshold — runaway oven temperature detected and heating element disabled. The F2 fault code on Haier ranges means the oven cavity temperature exceeded a preset safety limit — approximately 590°F (310°C) during normal cooking or 950°F (510°C) during self-clean. The range immediately cuts power to the heating element and enters Fault mode to prevent fire or appliance damage. Common causes include a failed temperature sensor sending false readings, a control board relay stuck closed, or a self-clean cycle started with excessive grease inside the oven. > Severity: High — This error requires professional service. --- ## Symptoms of the F2 Error When the F2 fault appears on your Haier QAS740RMSS: - Oven knob glows red (Fault mode) mid-cooking cycle

Oven shuts off unexpectedly during baking or broiling
Food burning or overcooking beyond the set temperature
Strong burning smell before the oven shuts down
F2 alert visible in the SmartHQ app on WiFi-enabled models --- ## Common Causes The F2 fault on the Haier QAS740RMSS is typically caused by: - Oven temperature sensor failed and sending erroneous high readings to the control board
Control board relay stuck closed — continuously supplying power to heating element
Excessive grease buildup igniting during self-clean cycle causing temperature spike
Oven door left ajar allowing heat buildup above normal levels
Faulty wiring between temperature sensor and control board causing erratic readings --- ## Step-by-Step Troubleshooting | Step | Action | What to Do | Expected Result | |------|--------|-----------|----------------| | 1 | Allow oven to cool before opening | Do not open the oven door immediately after F2 appears. Turn the knob to OFF and disconnect power. Allow 30-60 minutes for the oven to fully cool before inspecting anything inside the cavity. | Oven reaches room temperature before any inspection | | 2 | Clean grease buildup before retrying self-clean | If F2 occurred during self-clean, excessive grease may have been igniting inside. Before attempting self-clean again, manually wipe out all large grease deposits with a damp cloth. Never run self-clean on a heavily soiled oven. | Oven interior is free of major grease deposits | | 3 | Test the oven temperature sensor resistance | Locate the temperature sensor probe inside the oven cavity (typically at the upper back wall). With power disconnected, use a multimeter to measure the sensor resistance. At room temperature (70°F/21°C), a good sensor reads approximately 1,080-1,100 ohms. An out-of-range reading indicates a failed sensor. | Sensor resistance is within 1,080-1,100 ohms range | | 4 | Inspect sensor wiring harness | Trace the sensor cable from inside the oven cavity to the control board. Look for burnt insulation, pinched wires, or loose connector pins at either end. Damaged wiring can cause erratic temperature readings that trigger F2. | Wiring harness is intact with no visible burn marks | | 5 | Schedule professional repair | If the sensor tests correctly but F2 persists, the control board relay is likely stuck closed. This is an internal board failure requiring professional service. Contact Haier at 1-877-337-3639. Do not use the oven until F2 is fully resolved. | Authorized technician diagnoses and replaces faulty component | --- ## Frequently Asked Questions ### Is F2 on a Haier range dangerous? Yes — F2 means the oven temperature exceeded safe limits. Turn off the range immediately and do not use the oven again until the fault is diagnosed and repaired by a qualified technician. Using an oven with a runaway temperature condition is a serious fire hazard. ### Can a dirty oven cause an F2 error? Yes, particularly during self-clean cycles. Large amounts of grease inside the oven can ignite during self-clean, causing a rapid temperature spike that triggers F2. Always wipe out heavy grease deposits manually before running any self-clean cycle. ### How do I reset the F2 code on my Haier range? After the oven cools completely (at least 30 minutes), turn off the circuit breaker for 5 minutes, then restore power. If F2 was triggered by a one-time event such as a grease flare during self-clean, the range may operate normally after resetting. If F2 returns during normal cooking, the sensor or control board requires professional inspection. ### What temperature triggers F2 on a Haier range? The F2 safety threshold is approximately 590°F (310°C) during normal bake and broil modes. During self-clean mode the threshold is higher — around 950°F (510°C). The sensor triggers F2 when the actual oven temperature exceeds these manufacturer-set safety limits. ### How much does it cost to fix F2 on a Haier range? If caused by a failed temperature sensor the repair is for the part plus for labor. If the control board relay is faulty, board replacement costs plus labor. Repairs within the one-year Haier warranty are covered at no charge — call 1-877-337-3639. --- ### Is it safe to keep using my Haier QAS740RMSS with error F2? If error F2 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 Range 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 F2 on a Haier QAS740RMSS? Repair costs for error F2 on the Haier QAS740RMSS Range 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 Haier-authorized service provider for an accurate estimate based on your specific situation. ### What does error code F2 mean on a Haier Range? Error code F2 on Haier Range models indicates Oven temperature exceeded maximum safe threshold — runaway oven temperature detected and heating ele. 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 Haier QAS740RMSS with error F2? If error F2 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 Range 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 F2 on a Haier QAS740RMSS? Repair costs for error F2 on the Haier QAS740RMSS Range 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 Haier-authorized service provider for an accurate estimate based on your specific situation. ### What does error code F2 mean on a Haier Range? Error code F2 on Haier Range models indicates Oven temperature exceeded maximum safe threshold — runaway oven temperature detected and heating ele. 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.

Need Professional Help? If the F2 error persists, contact Haier Customer Service: - Phone: 1-877-337-3639

Online: Haierappliances.com
Warranty: One-year limited warranty covers in-home service at no charge Last Updated: March 2026