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Re: need a diaphragm for my rinnia water heater reu 56es
Sounds like tank froze with water in it. Have you checked the connections on the top of the heater they could be leaking also i would check water lines around that area for tees or 90 degree fittings. You can pull heater out and try to check it out. you can fill water heater with water to check to see if heater has a crack in it.
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Definitely sounds like there is a gas pressure problem. Are the gas lines feeding both appliances the proper size (at least 1/2" diameter)? Are they natural gas or propane units. If propane, what's the Btu rating of the regulator on the propane tank? If it's to low to handle the two appliance at one time, that could be the problem too.
To test the thermocouple you will need to heat the tip with a lighter and use fluke meter to test the millivoltage being produced by it. To purge the unit of air shut off the gas line valve. Disconnect the connecter on the unit. And turn on the valve just slightly for a few seconds and release a little bit of gas. Be very careful doing this!!! Make sure there are no sources of ignition nearby. A few seconds of bleeding should be enough to clear out any air in the gas line. Then re-connect and tighten connector using two wrenches(one for a backup) then turn thee valve back on and listen/smell for any gas and soap fittings to check for leaks. After the air is clear if this is a manually set pilot then push the ASO button you use to set the pilot. You may need to hold it for a minute to make sure all the air goes thru the pilot. Then light the pilot while holding the ASO button in. You may need to hold this for a minute or two. When you let go it should stay lit. Look for a strong pilot flame that is blue not yellow and is making proper impingment with the thermocouple/pilot generator head assembly. You will not be able to fully test this unit without the water on due to this unit works off of a pressure/flow switch and the burner will not come on if it does not have water flowing. If it is not electric ignition and the pilot is lit manually then you should be able to light the pilot and have it stay on.
code 12 is low gas pressure, or that the flame sensors are not picking up a flame, try removing the flame rods, in a rinnai infinity when you pull the cover off they are right in the middle, you can use a file to clean any carbon etc off,