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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 41 parts  |
Burner Orifice 66001172
#9E

Body diagram

Burner orifice

Part #66001172

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

Access Clips 66001204
Access clips

Part #66001204

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

Water Heater Temperature And Pressure Relief Valve 66001216
#13

Body diagram

Water heater temperature and pressure relief valve

Part #66001216

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

Flu Adapter 66001236
#17

Body diagram

Flu adapter

Part #66001236

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

Inner Door 66001029
#5

Body diagram

Inner door

Part #66001029

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

6" Vent Wall 66001444
#23

Body diagram

6" vent wall

Part #66001444

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

Burner Orifice 66001035
#9A

Body diagram

Burner orifice

Part #66001035

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

Nipple 66001311
#12

Body diagram

Nipple

Part #66001311

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

Learn how to decipher symbols so you can buy the right part for your problem.…

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Easy DIY water heater repairs

Easy DIY water heater repairs

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Water heater common questions

Water heater common questions

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