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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Browse Parts for
HM340NHDST Water Heaters
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

Securing Clamp Assembly 66001453
#4

Body diagram

Securing clamp assembly

Part #66001453

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

Tubing Pilot 66001276
#13

Body diagram

Tubing pilot

Part #66001276

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

Vent Cap 66001447
#1

Body diagram

Vent cap

Part #66001447

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

Manifold 66001026
#15

Body diagram

Manifold

Part #66001026

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

Washer, Drai 66001021
#10A

Body diagram

Washer, drai

Part #66001021

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

Gasket, Air Intake 66001463
#23A

Body diagram

Gasket, air intake

Part #66001463

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.

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

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: faulty pressure relief valve, water is overheating…

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

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

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.

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.…

Easy DIY water heater repairs

Easy DIY water heater repairs

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

Water heater common questions

Water heater common questions

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