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4 field manuals · 8 error codes · 0 guides

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Water Heater

State water heaters

Manual · Water Heater

A.O. Smith Voltex / ProLine XE Voltex hybrid heat pump water heater: quick sheet

A.O. Smith Voltex hybrid heat pump water heaters: older HPTU-50N/66N/80N, current ProLine XE Voltex HPTU-50CTA, FPTU-80, and Voltex AL Smart HPTS (anti-leak). Model letters vary by channel; confirm on the rating plate.

6 components2 common failuresA.O. Smith, State
Manual · Water Heater

Electric tank water heater: field service manual

Residential 240 V dual-element tank heaters (roughly 30-80 gal) with surface-mount upper thermostat/ECO and lower thermostat

6 components4 common failuresA.O. Smith, State, Rheem, Ruud, Richmond, Bradford White, Whirlpool
Manual · Water Heater

Gas tank water heater (atmospheric and power-vent): diagnostic and electrical-side manual

Residential standing-pilot FVIR tanks with thermopile electronic gas controls, and 120 V power-vent tanks; diagnosis and electrical/water-side only

4 components3 common failuresA.O. Smith, State, Rheem, Ruud, Bradford White, Whirlpool
Manual · Water Heater

Heat pump (hybrid) water heater: field service manual

Residential integrated heat pump water heaters with backup resistance elements

4 components3 common failuresRheem, A.O. Smith, Bradford White, State

Error codes

1 flash (every 3 s) Normal: pilot lit, control OK2 flashes Low thermopile voltage4 flashes Over-temperature shutdown (ECO)5 flashes Sensor failure7 flashes Gas control failure8 flashes Knob OFF but thermopile still pr…No light Control not powered: pilot outSteady (solid) light Control turned OFF, thermopile c…

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