A.O. Smith HPTU-50N HE Hybrid 50 Gal 4500W High Efficiency Hybrid Heat Pump Water Heater E07 Error Fix: Compressor Failure

Error code E07 on the A.O. Smith HPTU-50N HE Hybrid 50 Gal 4500W High Efficiency Hybrid Heat Pump Water Heater means: Compressor Failure. The heat pump compressor has failed to start or has a locked rotor condition. The compressor is the heart of the heat pump system. Check the compressor electrical connections and the run/start capacitor. Test the compressor windings with a multimeter for open or short circuit. A locked rotor condition may clear after the unit cools down. If the compressor consistently fails to start, it will need professional replacement. The unit will continue to heat water using electric backup elements.

The most successful fix is "Test Compressor Windings and Replace Compressor if Needed" (hard difficulty, ~120 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Test Compressor Windings and Replace Compressor if Needed") is rated hard difficulty and takes about 120 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Capacitance meter, Voltage tester.

DIY cost: $10-$20. Professional repair typically costs $500-$800. Many homeowners save money by trying the top-ranked community fix first.

The A.O. Smith HPTU-50N HE Hybrid 50 Gal 4500W High Efficiency Hybrid Heat Pump Water Heater has 8 other known error codes, including: E01 (Upper Tank Sensor Failure), E02 (Lower Tank Sensor Failure), E03 (Dry Fire / ECO Trip), E04 (Compressor Discharge Over-Temperature), E05 (Evaporator Coil Sensor Failure), and 3 more.

Error code E07 also appears on 1 other A.O. Smith model: AHPTU-80 Voltex Hybrid 80 Gal 4500W Hybrid Heat Pump Water Heater with WiFi Connectivity. The fix may vary by model, so check each model's specific page for tailored repair steps.