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Maytag
Gas Water Heater

Model # HM340NHDST Official Maytag gas water heater

Here are the diagrams and repair parts for Official Maytag HM340NHDST gas 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 40 parts  |
Gas Conversion Kit Valve 66001457
#17

Body diagram

Gas conversion kit valve

Part #66001457

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

Blower Gasket 66001405
#23

Body diagram

Blower gasket

Part #66001405

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

Pipe, Extension (10") (optional) 66001448
#2

Body diagram

Pipe, extension (10") (optional)

Part #66001448

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

Outer Door 66001462
#22

Body diagram

Outer door

Part #66001462

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

Kit, Roof Jack Vent (60") (non-illus) 66001451
#3B

Body diagram

Kit, roof jack vent (60") (non-illus)

Part #66001451

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

Manifold 66001322
#15A

Body diagram

Manifold

Part #66001322

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

Tube, Diffuser Dip (w/nipple) 66001419
#9

Body diagram

Tube, diffuser dip (w/nipple)

Part #66001419

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

Primary Rod 66001020
#7

Body diagram

Primary rod

Part #66001020

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

Grommet, Manifold 66001460
#20

Body diagram

Grommet, manifold

Part #66001460

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

Thermocouple 66001273
#12

Body diagram

Thermocouple

Part #66001273

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

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

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Water heater common questions

Water heater common questions

These common questions and answers can help you make the most of your water heater....

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