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Thermar
Gas Water Heater

Model # PM1000 Official Thermar tankless water heater

Here are the diagrams and repair parts for Official Thermar PM1000 tankless 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 39 parts  |
Thermocouple 239-37326-00
#13

Replacement parts diagram

Thermocouple

Part #239-37326-00

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

Pilot Assembly 239-37379-00
#27

Replacement parts diagram

Pilot assembly

Part #239-37379-00

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

Regulator 239-37370-00
#35

Replacement parts diagram

Regulator

Part #239-37370-00

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

Chassis Assembly 239-37382-00
#1

Replacement parts diagram

Chassis assembly

Part #239-37382-00

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

Manifold Assembly 239-37343-00
#12A

Replacement parts diagram

Manifold assembly

Part #239-37343-00

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

Diagram 239-37316-00
#19

Replacement parts diagram

Diagram

Part #239-37316-00

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

Manifold Assembly 239-37342-00
#12

Replacement parts diagram

Manifold assembly

Part #239-37342-00

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

Start Button 239-37321-00
#32

Replacement parts diagram

Start button

Part #239-37321-00

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

Valve 239-37340-00
#21

Replacement parts diagram

Valve

Part #239-37340-00

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

Housing Assembly 239-37320-00
#18

Replacement parts diagram

Housing assembly

Part #239-37320-00

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

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

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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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Wiring schematic symbols explained video

Wiring schematic symbols explained video

Learn some of the most common symbols found in a wiring diagram and what they mean.…

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Using a wiring schematic to trace a current video

Using a wiring schematic to trace a current video

Find out what’s wrong with your appliance by following a circuit.…

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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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