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Electric Water Heater

Model # ECT40 Official AO Smith water heater

Here are the diagrams and repair parts for Official AO Smith ECT40 water heater, as well as links to manuals and error code tables, if available.

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Browse Parts forECT40 Water Heaters

  • Anode Rod 183523-029
    #9

    Water heater diagram

    Anode rod

    Part #183523-029

    Replaced by #100109624

    ?
    Manufacturer substitution
    This part replaces 183523-029. Substitute parts can look different from the original.
    $51.59
    10% OFF Phone Price : $57.59
    Back Order
  • Element 042286-021
    #14

    Water heater diagram

    Element

    Part #042286-021

    Replaced by #100108283

    ?
    Manufacturer substitution
    This part replaces 042286-021. Substitute parts can look different from the original.
    $39.45
    13% OFF Phone Price : $45.45
    Back Order
  • Bracket 184608-000
    #12

    Water heater diagram

    Bracket

    Part #184608-000

    Replaced by #100108380

    ?
    Manufacturer substitution
    This part replaces 184608-000. Substitute parts can look different from the original.
    In Stock
  • Thermostat 182359-000
    #16

    Water heater diagram

    Thermostat

    Part #182359-000

    Replaced by #100110039

    ?
    Manufacturer substitution
    This part replaces 182359-000. Substitute parts can look different from the original.
    In Stock
  • Thermostat 182354-000
    #13

    Water heater diagram

    Thermostat

    Part #182354-000

    Replaced by #100109846

    ?
    Manufacturer substitution
    This part replaces 182354-000. Substitute parts can look different from the original.
    $75.10
    7% OFF Phone Price : $81.10
    In Stock
  • Access Panel 181260-000
    #1

    Water heater diagram

    Access panel

    Part #181260-000

    Replaced by #100109599

    ?
    Manufacturer substitution
    This part replaces 181260-000. Substitute parts can look different from the original.
    $47.04
    11% OFF Phone Price : $53.04
    In Stock
  • Element 042286-022
    #6

    Water heater diagram

    Element

    Part #042286-022

    Replaced by #9000095015

    ?
    Manufacturer substitution
    This part replaces 042286-022. Substitute parts can look different from the original.
    $24.29
    20% OFF Phone Price : $30.29
    In Stock
  • Terminal Cover 182360-000
    #11

    Water heater diagram

    Terminal cover

    Part #182360-000

    Replaced by #100109598

    ?
    Manufacturer substitution
    This part replaces 182360-000. Substitute parts can look different from the original.
    In Stock
  • Terminal Cover 182117-001
    #15

    Water heater diagram

    Terminal cover

    Part #182117-001

    Replaced by #100110879

    ?
    Manufacturer substitution
    This part replaces 182117-001. Substitute parts can look different from the original.
    In Stock
  • Dip Tube 183900-052
    #2

    Water heater diagram

    Dip tube

    Part #183900-052

    Replaced by #100108609

    ?
    Manufacturer substitution
    This part replaces 183900-052. Substitute parts can look different from the original.
    In Stock

Most common symptoms to help you fix your water heaters

Choose a symptom to see related water heater repairs.

Main causes: lack of power, no gas supply, thermostat limit switch tripped, bad element, bad thermostat, gas valve failu…

Main causes: thermostats need adjustment, water heater capacity too low, bad heating element, thermostat failure, excess…

Main causes: loose water pipe fittings, leaky drain valve, bad temperature-pressure relief valve, leaky heating element,…

Main causes: water supply needs chlorine treatment, anode rod too reactive…

Main causes: broken heating element, thermostat failure, excessive tank sediment, tank size too small, burner valve asse…

Main causes: thermostat temperature set too high, thermostats need adjustment, faulty thermostat, shorted heating elemen…

Main causes: faulty pressure relief valve, water is overheating…

Repair guides for electric water heaters

How to replace a water heater element

How to replace a water heater element

If your water heater runs out of hot water quickly and one of the two heating elements has failed, replace the element f…

Repair difficulty
Time required
 30 minutes or less
How to replace a water heater temperature and pressure (T&P) relief valve

How to replace a water heater temperature and pressure (T&P) relief valve

Replace a broken temperature/pressure (T&P) relief valve on an electric water heater using these instructions.…

Repair difficulty
Time required
 15 minutes or less
How to replace an electric water heater thermostat

How to replace an electric water heater thermostat

If the water temperature fluctuates or you don't get enough hot water, follow these instructions to replace your water h…

Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your water heaters

Use the advice and tips in these articles and videos to get the most out of your water heater.

Wiring schematic symbols explained video

Wiring schematic symbols explained video

Learn some of the most common symbols found in a wiring diagram and what they mean.…

Using a wiring schematic to trace a current video

Using a wiring schematic to trace a current video

Find out what’s wrong with your appliance by following a circuit.…

Easy DIY water heater repairs

Easy DIY water heater repairs

Read about some water heater repairs that you can easily do yourself.…

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