Reliance
Gas Water Heater

Model # 640HCRS103 Official Reliance water heater

Here are the diagrams and repair parts for Official Reliance 640HCRS103 water heater, as well as links to manuals and error code tables, if available.

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

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Model diagram and schematic

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Showing 10 of 19 parts  |

Water Heater Thermocouple (replaces 194621, 6900725, 9000056, 9002322) 9000056015
#NI

Water heater diagram

Water heater thermocouple (replaces 194621, 6900725, 9000056, 9002322)

Part #9000056015

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$17.72
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In Stock
State Gas Control 9006606005
#NI

Water heater diagram

State gas control

Part #9006606005

In Stock
Window Assembly 9006142015
#NI

Water heater diagram

Window assembly

Part #9006142015

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Water Heater Burner (replaces 100111320) 9006603005
#NI

Water heater diagram

Water heater burner (replaces 100111320)

Part #9006603005

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Water Heater Manifold Door Gasket 9006141015
#NI

Water heater diagram

Water heater manifold door gasket

Part #9006141015

$25.49
19% OFF Phone Price : $31.49
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State Water Heater Gas Control Valve 9006604005
#8

Water heater diagram

State water heater gas control valve

Part #9006604005

In Stock
Dip Tube 9006131005
#4

Water heater diagram

Dip tube

Part #9006131005

Replaced by #100110924

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Manufacturer substitution
This part replaces 9006131005. Substitute parts can look different from the original.
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Anode Rod 9003944005
#1

Water heater diagram

Anode rod

Part #9003944005

Replaced by #100109624

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Manufacturer substitution
This part replaces 9003944005. Substitute parts can look different from the original.
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Anode Rod 9003721005
#1A

Water heater diagram

Anode rod

Part #9003721005

Replaced by #100109434

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Manufacturer substitution
This part replaces 9003721005. Substitute parts can look different from the original.
In Stock
Drain Valve 9003906015
#6

Water heater diagram

Drain valve

Part #9003906015

Replaced by #9009086015

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Manufacturer substitution
This part replaces 9003906015. Substitute parts can look different from the original.
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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…

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

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Using a wiring schematic to trace a current video

Using a wiring schematic to trace a current video

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Easy DIY water heater repairs

Easy DIY water heater repairs

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