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My water heater is a "Marey" propane and the water won't get hot and it keeps saying "E2" I lost my manual so I can't see what that means. Do you know?

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An E2 code is often an indicator of an electrical problem inside the water heater. The most common problem is with the inlet water temperature sensor. Often a reset will fix the problem. To achieve the reset unplug the unit. Open the unit being careful of fragile electrical wires. Next remove the computer board and then disconnect each plug in wire and reseat them one at a time. Reassemble the unit and plug it in. It should be in working condition, without the E2 code.
Marey electric heater E2 error Marley Water Heaters

and also another idea here

found this helpful answer from plumber on JustAnswer com

and finally, how I found the answers.

E2 Google Search

Posted on Apr 26, 2017

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Posted on Jan 02, 2017

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Troubleshoot service manual by type of gas control valve
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
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Before calling service technician, open following link for Rheem troubleshoot resources including Rheem chat and typical generic manuals and common error codes:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Model number and serial number are required for Rheem contact, and then they tell you what error code means without saying how to fix it, and then tell you to call service technician.

Tankless water heater manuals each say to have qualified technician perform yearly service. Most causes for common error codes are covered by yearly service.

Yearly service is fairly standard in the HVAC and water heater industry with advancement of high-tech 'energy' saving appliances. Of course all costs are energy, and the service call probably costs more that the 'energy' saved by energy-saving appliance. But with high tech stuff like tankless, it is good to have a reliable service guy who knows your machine.
http://waterheatertimer.org/images/Tankless-wiring-1200.jpg

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