A. O. Smith · Voltex hybrid with letter codes (HPTU, 2016–2019)
A. O. Smith Voltex hybrid with letter codes (HPTU, 2016–2019) error code E60
Upper and lower sensors
What it means
Upper and Lower Temperature Sensor are not functioning.
How it shows: may have an audible alarm; to cancel the audible alarm, press any button on the UIM
What A. O. Smith says to do
These steps involve electrical testing or parts replacement. A. O. Smith's manuals tell owners to leave that work to a qualified service technician.
Power off (Power Cycling the unit), disconnect and reconnect J2 and J5 connections from control board, inspect wire for damage, re-install UIM, reconnect power. If error persists, replace temperature sensor.
Last checked 2026-10-03.
Safety first
- WARNING! Electric Shock Hazard; Disconnect power before servicing. Do not remove the plastic guard from over wiring. Do not touch electrical wiring. Failure to do so can result in death or electrical shock. (diagnostic code pages, p.20-21)
- WARNING! Working near an energized circuit can result in severe injury or death from electrical shock. WARNING! When you are finished, be sure all covers are secured to reduce the risk of fire and electric shock. (p.22)
From the manufacturer's manual for this series.
Other Voltex hybrid with letter codes (HPTU, 2016–2019) codes
- - / -- / --- (System diagnostic)
- ICE (Defrost)
- HPO (Out of operating range)
- EUC (Upper element)
- ELC (Lower element)
- SF (Air filter)
- ECF (Compressor short cycling)
- E20 or E21 (Upper temperature sensor)
- E30 or E31 (Lower temperature sensor)
- E50 or E51 (Suction temperature sensor)
- E10 or E11 (Coil temperature sensor)
- E40 or E41 (Discharge temperature sensor)
- Edr (Dry fire / tank not full)
- EPL (Low supply voltage)
- EDH (Discharge temperature high)
- EoF (Condensate management)
- ECL (Suction pressure low)
- EEE (EEPROM failure)
- ECC (Compressor not functioning)
- ECE (Power supply error)