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Maytag
Gas Water Heater

Model # HJ640NBDSCGA Official Maytag water heater

Here are the diagrams and repair parts for Official Maytag HJ640NBDSCGA water heater, as well as links to manuals and error code tables, if available.

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Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 44 parts  |
Plate, Adapt 66001240
#19

Body diagram

Plate, adapt

Part #66001240

The manufacturer no longer makes this part, and there's no substitute part

Washer, Drai 66001021
#4A

Body diagram

Washer, drai

Part #66001021

The manufacturer no longer makes this part, and there's no substitute part

Elbow, Flue 66001211
#21

Body diagram

Elbow, flue

Part #66001211

The manufacturer no longer makes this part, and there's no substitute part

Access Door 66001205
#1

Body diagram

Access door

Part #66001205

The manufacturer no longer makes this part, and there's no substitute part

Clips, Jacke 66001242
#5A

Body diagram

Clips, jacke

Part #66001242

The manufacturer no longer makes this part, and there's no substitute part

Burner Orifice 66001040
#9B

Body diagram

Burner orifice

Part #66001040

The manufacturer no longer makes this part, and there's no substitute part

Collar Liner 66001446
#22

Body diagram

Collar liner

Part #66001446

The manufacturer no longer makes this part, and there's no substitute part

Anode Rod 66001157
#14

Body diagram

Anode rod

Part #66001157

The manufacturer no longer makes this part, and there's no substitute part

Burner Orifice 66001025
#9

Body diagram

Burner orifice

Part #66001025

The manufacturer no longer makes this part, and there's no substitute part

Gasket, Adap 66001239
#18A

Body diagram

Gasket, adap

Part #66001239

The manufacturer no longer makes this part, and there's no substitute part

Most common symptoms to help you fix your water heaters

Choose a symptom to see related water heater repairs.

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Why isn't my water heater heating my water?

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

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Why is there water in my water heater's drain pan?

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

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Why does my hot water smell like rotten eggs?

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

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Why isn't my water heater making enough hot water?

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

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Why is my water heater's pressure relief valve dripping water?

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

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Why isn't my water heater making the water hot enough?

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

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Why is my water heater making the water too hot?

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

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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.

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How to read a wiring schematic video

How to read a wiring schematic video

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Water heater common questions

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