A. O. Smith · Voltex hybrid with letter codes (HPTU, 2016–2019)

A. O. Smith Voltex hybrid with letter codes (HPTU, 2016–2019) error code EoF

Condensate management

What it means

Condensate management.

How it shows: may have an audible alarm; to cancel the audible alarm, press any button on the UIM

Source: Hybrid Electric Heat Pump Water Heater Installation Instructions and Use & Care Guide, 100323093_2000578009, page 21

What A. O. Smith says to do

1. Ensure unit is installed level. 2. Check for blocked primary or secondary condensate drain lines, clear drain lines as necessary. 3. If an accessory condensate pump was installed: Turn off power to the water heater at the breaker and check control wire connections to condensate pump. 4. Check to see if the accessory condensate pump is plugged in and has power. 5. Ensure the pump is operating properly, check pump outlet tube for blockage. 6. Repair or replace accessory condensate pump as necessary. 7. If problem persists, call our Technical Assistance Hotline which is listed on the water heater's warranty sheet.

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.

The same code on other models

Codes mean different things on different heaters. Match the series to the model number on your rating label.

A. O. Smith Voltex hybrid with letter codes (HPTU, 2016–2019) error code EoF

What it means

What A. O. Smith says to do

Safety first

The same code on other models

Other Voltex hybrid with letter codes (HPTU, 2016–2019) codes