Reliance
Gas Water Heater

Model #640HJRS103 Official Reliance water heater

Here are the diagrams and repair parts for Reliance 640HJRS103 water heater, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Error Codes

    Showing 10 of 19 parts

    Water Heater Thermocouple#NI

    Water heater Diagram

    Water heater thermocouple

    Part #9000056015
    BEST SELLER
    In Stock
    $21.99 | 
    19% OFF 
    Phone Price: $26.99
    Water Heater Anode Rod#1

    Water heater Diagram

    Anode rod

    Part #9003944005
    Replaced by #9003944005
    ?
    Manufacturer substitution
    This part replaces 9003944005. Substitute parts can look different from the original.
    BEST SELLER
    Back Order
    $35.09 | 
    12% OFF 
    Phone Price: $40.09
    Water Heater Pilot Igniter#NI

    Water heater Diagram

    Igniter

    Part #9006143015
    Replaced by #9006143015
    ?
    Manufacturer substitution
    This part replaces 9006143015. Substitute parts can look different from the original.
    BEST SELLER
    Back Order
    $21.09 | 
    19% OFF 
    Phone Price: $26.09
    Water Heater Burner#NI

    Water heater Diagram

    Water heater burner

    Part #9006603005
    In Stock
    $48.83
    Water Heater Manifold Door Gasket#NI

    Water heater Diagram

    In Stock
    $25.49 | 
    16% OFF 
    Phone Price: $30.49
    Dip Tube#4

    Water heater Diagram

    Dip tube

    Part #9006131005
    In Stock
    $24.58
    Water Heater Gas Control Valve#8

    Water heater Diagram

    In Stock
    $228.86
    Window Assembly#NI

    Water heater Diagram

    Window assembly

    Part #9006142015
    In Stock
    $17.99
    Gas Control#NI

    Water heater Diagram

    Gas control

    Part #9006606005
    In Stock
    $202.90
    Anode Rod#1A

    Water heater Diagram

    Anode rod

    Part #9003721005
    In Stock
    $26.08

    Symptoms common to all 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 failure, bad thermocouple
    Main causes: water supply needs chlorine treatment, anode rod too reactive
    Main causes: thermostats need adjustment, water heater capacity too low, bad heating element, thermostat failure, excessive tank sediment
    Main causes: thermostat temperature set too high, thermostats need adjustment, faulty thermostat, shorted heating element
    Main causes: faulty pressure relief valve, water is overheating
    Main causes: broken heating element, thermostat failure, excessive tank sediment, tank size too small, burner valve assembly failure
    Main causes: loose water pipe fittings, leaky drain valve, bad temperature-pressure relief valve, leaky heating element, cracked tank

    Articles and videos common to all water heaters

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

    October 24, 2022

    Easy DIY appliance repairs that anyone can do

    By Lyle Weischwill

    Get advice on simple DIY fixes for appliances that you can safely do on your own.

    August 18, 2021

    Wiring schematic symbols explained video

    By Lyle Weischwill

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

    April 10, 2020

    Cleaning your appliances after a drinking water advisory

    By Julie Riebe

    Find out how to clean and flush household appliances once a boil water advisory is lifted.