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Marathon
Electric Water Heater

Model # MX85155 Official Marathon water heater

Here are the diagrams and repair parts for Official Marathon MX85155 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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Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 51 parts  |
Control 310030
#12

Functional replacement parts diagram

Control

Part #310030

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

Control 310020
#6B

Functional replacement parts diagram

Control

Part #310020

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

Drain Valve 330010
#2

Functional replacement parts diagram

Drain valve

Part #330010

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

Wrench 610070

#NI

All parts diagram

Wrench

Part #610070

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

Dip Tube 230015
#16F

Functional replacement parts diagram

Dip tube

Part #230015

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

Panel 410969
#9GB

Functional replacement parts diagram

Panel

Part #410969

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

Dip Tube 230019
#16H

Functional replacement parts diagram

Dip tube

Part #230019

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

Dip Tube 230018
#16K

Functional replacement parts diagram

Dip tube

Part #230018

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

Dip Tube 230024
#16E

Functional replacement parts diagram

Dip tube

Part #230024

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

Panel 410966
#9HB

Functional replacement parts diagram

Panel

Part #410966

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 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 does my hot water smell like rotten eggs?

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

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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 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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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 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 enough hot water?

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

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Repair guides for electric water heaters

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How to replace a water heater element

How to replace a water heater element

If your water heater runs out of hot water quickly and one of the two heating elements has failed, replace the element f…

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Repair difficulty
Time required
 30 minutes or less
How to replace a water heater temperature and pressure (T&P) relief valve

How to replace a water heater temperature and pressure (T&P) relief valve

Replace a broken temperature/pressure (T&P) relief valve on an electric water heater using these instructions.…

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Repair difficulty
Time required
 15 minutes or less
How to replace an electric water heater thermostat

How to replace an electric water heater thermostat

If the water temperature fluctuates or you don't get enough hot water, follow these instructions to replace your water h…

Read more
Repair difficulty
Time required
 30 minutes or less

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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