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Check that the gas is turned on at the water heater, gas meter, or cylinder.
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Disconnect EZConnect™ or MSA controls to isolate the problem.
Ensure igniter is operational.
Check igniter wiring harness for damage.
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure all burners are properly seated.
Remove burner plate and inspect burner surface for condensation or debris.
IF it has been working fine and now it isn't, I would suspect an ignitor problem.
IF THIS UNIT HAS SPARK IGNITION THE IGNITORS ARE PROBABLY OUT OF ADJUSTMENT WHICH IS LIKE HAVING TO WIDE OF A GAP ON A SPARK PLUG . IF YOU MAKE GAP OF IGNITOR ELECTRODES APPROXIMATELY 1/8TH OF AN INCH APART IT SHOULD LIGHT AS LONG AS YOU ARE GETTING VOLTAGE FROM IGNITION COIL. CALL A SERVICE TECH
The first thing that you should do is get a water sample and have it tested for TUBIDITY. Then see what the contaminates are. This will tell you what the problem is. I seriously doubt what Rinnai is telling you is the truth. Then you need to look into a whole house water filter that has an NSF recommendation. That will stop all the issues that you are having.
Error Code 10
Problem: Reduced or no air supply to the water heater or there is an obstruction in extracting the flue gases out.
Solution: Make sure that the recommended Rinnai venting is used, there is no obstruction in the venting system, no reduction in diameter and lengths are per instructions. Also make sure that nothing blocks the venting system or fan, and that dip switch and condensation collar are set properly.
This is an error code 12, not 12 degrees. You have a short on your low voltage side by the sounds of it.. First disconnect the controllers inside the heater. Turn of the power first, 2 screws top and bottom to take the frnot panel off. Follow the low voltage wires (not the power point ones) to the PCB on the ride side and disconnect them both. Panel back on, power on and try the heater again. If this fixes it you have a short circuit in the controller or the wires leading to it. If not the most likely short circuit is on the thermal fuse which loops around the heat exchanger. This will need an expert, Perth has plenty north and south of the river. Give Rinnai a ring first, they have some good staff in Perth who might help.
Error 12 is failed ignition - this can be caused by many things, but normally a low gas pressure, or no gas pressure upon ignition.
Try turning the hot tap on very slowly till till the control shows burner is lit. Then turn it on faster. If it stays going with no error, you might have a faulty regulator, not opening fast enough to meet demand. Especially common with lpg models,a lot rarer on natural gas.