I have Marey nat.gas.water heater (3 years old) now the flame goes on for a second and goes off ,pezo try to restarted but wont go back on ,any solutions ?? many thanks

Hello, busby_betty -

Clarification: You have a Marey ECO180 Electric Tankless Water Heater. If so, I checked the owner's manual, here:
https://marey.com/english/products/electric-water-heater/whole-house/eco180.html
in case your problem was mentioned in the Troubleshooting section. It wasn't.

Therefore, before you call for a repair technician to come and evaluate your water heater, I suggest you telephone the Marey Customer Service number: 855-627-3955 to find if the Customer Service representative has any ideas on what needs fixing. Or, you can send an email: [email protected] .

When you contact Marey Customer Service, ask about the nearest authorized Marey water heater service business, so you may call and make an appointment for a service technician to come to your home and check what is wrong and repair it.

If you were hoping an authorized Marey water heater repair person was sitting on Fixya.com waiting for questions about Marey water heaters, that isn't the case.

Note: It may be a problem with the water heater thermostat or the or the heating sensor. Also, check the information here:
https://www.doityourself.com/forum/water-heaters/548564-help-marey-electric-water-heater.html
(Copy the URL and paste it into the address box of your browser, if it isn't hightlighted as a link.)

The real problem may be with the electrical wiring and circuit to which the water heater is connected.

Sometime the batteries in the drawer fade (yes even new ones). I am asking, is that after the flow initially stops, the Automatic Start will not fire up when there is a demand for hot water (Is this what you meant when you say "The water is turned off" and "Then on again". Check the batteries for being the right way around (I Have installed them 1/2 forward and 1/2 back ward as a set, the one cancelled the other one out....my Bad....Ooops) The battery should be only needed if the power fails, but not sure about this model. Does the Owners manual say anything about no hot water? IF that was tried, you may need to call the heating / cooling techs that are familiar with this unit.

http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

contact your gas company if the error code is "12," indicating that the gas supply was interrupted.

have a good day !! In LP models, the 12 error code may also appear if the LP gas supply has gotten low. To clear the code, replace or refill the LP gas supply.

go here for a list of codes for rheem tankless water heaters-- www.ehow.com/list_7833182_error-rheem-gas-water-heater.html

Do you have a natural gas or propane water heater. You could possibly have a dirty valve which stops the flow of the gas. Has there been a change with the environment of the water heater. Check for the draft and back blow of the available air. If the water heater is over 6 years old maybe it is time to replace the unit. Good Luck

The pilot light can be blown out just by the main gas being ignited especially if the pilot flame is a little weak. Some times a bit of grit gets into the pilot nozzle reducing the flow and hence a weak flame. Try cleaning the piolt jet nozzle with a fine piece of wire. You may have to dismantle the jet nozzle to clean it properly.

The flame sensor is not sensing flame and the unit shuts off on safety. You can try cleaning the sensor, but will likely have to replace it. Also clean the burners. Sometimes there can be rust, dirt, or other dibri that causes an improper flame pattern and prevents the sensor from being fully in the flame.

With some units, the flame sensor is a seperate part, with others it is a part of the ignition assembly. Those can typically run 30 to 80 dollars for the part.

It sounds like your flame detector (usually a thermocouple) has gotten weak and when you cleaned the pilot the stronger flame was able to generate enough power to keep the gas valve working. If you replace the thermocouple your problem should go away. If a new thermocouple will not keep the gas valve operating...the coil in the gas valve has gone bad and you will need to replace the gas valve assembly. (most valves do not have replaceable coils).

On the back of the gas valve (where you turn the temp up) there is a stem that actually goes into the tank that senses the temprature of the water it could be dirty or buried in sediment depending on how old the tank is, or just bad. if the tank is over 10 years old i wouldn't bother replacing the gas valve, the tank is probably not far behind. A new valve will run around $100.00 maybe a little less. You wont find it at menards or home depot in stock but they may be able to order it for you. Menards sells rheem products or try you local plumbing supply house. REMEMBER TO RELIEVE THE PRESSURE ON THE TANK BEFORE YOU WORK ON IT. IF YOU CHANGE THE VALVE DRAIN IT FIRST!