A.O. Smith dve-80 User Manual

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Service Handbook

PRINTED IN THE U.S.A 0908 315014-000

SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE AGENT.

COMMERCIAL ELECTRIC WATER HEATERS

MODELS DRE-52/80/120 SERIES 100

& DVE-52/80/120 SERIES 100

INSTALLATION CONSIDERATIONS - PRE SERVICE

CHECKS - WATER HEATER CONSTRUCTION -

OPERATION & SERVICE - TROUBLESHOOTING

500 Tennessee Waltz Parkway

Ashland City, TN 37015

http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html

http://waterheatertimer.org/3-phase-water-heater.html

Table of Contents

Questions and Answers:

M
Michael HarperAug 5, 2025
Why A.O. Smith dve-80 Water Heater has no hot water?
- A
  Angela RodriguezAug 5, 2025
  If your A.O. Smith Water Heater isn't producing hot water, it could be due to a hot water supply valve being turned off. If you have Surface Mount Control Models, check the thermostat/ECO controls. For Electronic Control Models, verify the Operating Set Point and Differential Set Points. Also, for Electronic Control Models, make sure both enable/disable circuits at the CCB’s J7 plug/socket connection are closed circuits.
M
Matthew CastilloAug 13, 2025
What to do if A.O. Smith Water Heater trips breaker?
- A
  Alexis BellAug 13, 2025
  If your A.O. Smith Water Heater is tripping the breaker, ensure that the power supply breaker/fusing to the water heater meets the minimum required fuse/wire/breaker sizing, referring to the voltage and amperage listed on the water heater rating plate. Also, verify that the internal power supply phase wiring is configured correctly. Check for any pinched or shorted wiring, whether it's internal or in the power supply wiring.
V
varnoldAug 17, 2025
What to do if A.O. Smith dve-80 Water Heater shows 'No Current Detected'?
- S
  Sean EvansAug 17, 2025
  If your A.O. Smith Water Heater displays a “No Current Detected” alert, first ensure the power supply to the water heater matches the voltage listed on the rating plate. For 3-phase models, check for a dead leg of power. Also, check the power circuit fuses, heating elements, and contactors. Inspect the power circuit wiring to heating elements from the Power Distribution Block, to fuse blocks, to contactors, to heating elements, referring to the wiring diagram and Contactor Configuration illustration. Correct any miswiring and repair or replace damaged wiring as needed. Check the Element Sensor J12, J13, J14 plug/socket connections at the CCB for wear or damage, ensuring they are properly connected. Finally, check the Element Sensors themselves and replace any that are defective.
H
holdenaprilAug 21, 2025
What causes 'Energy Cut Out (ECO)' fault in A.O. Smith Water Heater?
- M
  Michael SmithAug 21, 2025
  If your A.O. Smith Water Heater is showing an 'Energy Cut Out (ECO)' fault, check the J5 plug/socket connections at the CCB to ensure they are properly connected. Check the ECO continuity and for 120 VAC to and from the ECO. Replace the Immersion Temperature Probe if the ECO switch contacts remain open at normal operating temperatures. Also, inspect the water system piping to ensure no external heat sources are adding heat to the water inside the water heater.
A
Andrew KiddAug 26, 2025
What does 'Temp Probe Short' mean on A.O. Smith dve-80 Water Heater?
- J
  Joshua FigueroaAug 26, 2025
  If your A.O. Smith Water Heater is displaying a “Temp Probe Short” fault, check for pinched or shorted wires between the J5 plug/socket connection on the CCB and the Immersion Temperature Probe. Repair or replace any damaged wiring. Also, check the resistance of the temperature sensor inside the Immersion Temperature Probe; replace the probe if the measured resistance is below 390 ohms.
S
Sean LawrenceAug 30, 2025
How to resolve 'Temp Probe Open' fault on A.O. Smith dve-80?
- P
  Patricia DayAug 30, 2025
  If your A.O. Smith Water Heater is showing a 'Temp Probe Open' fault, check the J5 plug/socket connections at the CCB to ensure they are properly connected. Check the resistance of the temperature sensor inside the Immersion Temperature Probe. Also, check for pinched or broken wiring between the Immersion Temperature Probe and the J5 plug/socket connection on the CCB; repair or replace damaged wiring as necessary.

A.O. Smith dve-80 Specifications

General

Brand	A.O. Smith
Model	DVE-80
Type	Electric Water Heater
Capacity	80 Gallons
Power Source	Electric
Voltage	240V
Energy Factor	0.95
Warranty	6 Years
Wattage	4500W

Summary

COMMERCIAL ELECTRIC WATER HEATERS

MODELS DRE-52/80/120 SERIES 100 & DVE-52/80/120 SERIES 100

Specifies the models covered by the service handbook.

INSTALLATION CONSIDERATIONS - PRE SERVICE CHECKS - WATER HEATER CONSTRUCTION - OPERATION & SERVICE - TROUBLESHOOTING

Outlines the main sections of the service manual.

INTRODUCTION

QUALIFICATIONS - QUALIFIED SERVICE AGENT

Defines the qualifications required for servicing the water heaters.

SERVICE WARNING

Provides a warning for individuals not qualified to perform service.

IMPORTANT SERVICE REMINDER

Highlights critical steps for troubleshooting and avoiding downtime.

TOOLS REQUIRED

ELECTRICAL REQUIREMENTS

Grounding

Stresses the importance of proper grounding according to electrical codes.

Power Supply

Advises verifying power supply phase and voltage against the rating label.

PRE SERVICE CHECKS

SERVICE PRECAUTIONS

Lists crucial safety precautions and procedures before servicing.

WATER HEATER CONSTRUCTION

OPERATION & SERVICE

Checking Single Phase (1Ø) Power

Checking Three Phase (3Ø) Power

FUSES

Thermostat & ECO Test

HEATING ELEMENTS

Heating Element Amperage Test

Heating Element Voltage Test

Heating Element Resistance & Ground Tests

Contactor Coil Voltage - At Contactor

Contactor Coil Voltage - At CCB

TRANSFORMERS

120 VAC Control Circuit Transformer Test

24 VAC Transformer Test

IMMERSION TEMPERATURE PROBE

Temperature Sensor Resistance Test

Temperature Sensor DC Voltage Test

ECO Continuity Test

ECO Voltage Test

ELECTRONIC CONTROLS

Checking Power and Ground To The CCB

ELECTRONIC CONTROL SYSTEM

TEMPERATURES MENU

ECONOMY MODE SETUP MENU

CURRENT FAULT / ALERT MENU

TROUBLESHOOTING

COMMON SERVICE PROBLEMS

Lists common issues and their troubleshooting steps.

ELECTRONIC CONTROL MODELS

Fault Conditions

Describes fault messages and lockout behavior.

Alert Conditions

CONTROL SYSTEM UNRESPONSIVE

Troubleshooting steps for an unresponsive control system.

FAULT AND ALERT MESSAGES

"No Current Detected" (Alert Condition)

Troubleshooting for "No Current Detected" alert.

Fault & Alert Messages

"Temp Probe Open" (Fault Condition)

Troubleshooting for "Temp Probe Open" fault.

"Energy Cut Out (ECO)" (Fault Condition)

Troubleshooting for "Energy Cut Out (ECO)" fault.

"Temp Probe Short" (Fault Condition)

Troubleshooting for "Temp Probe Short" fault.

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