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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
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.
LC is the error code that you get when you have limescale buildup in the heat exchanger. You need to flush your heat exchanger. If you have the manual for your water heater, use it. The manual to mine is attached. The procedure for flushing it is covered on page 12. I suggest that you have a certified Rinnai plumber perform this task as it requires a ciruclating pump and some hoses that you need to connect to your water heater. If you don't perform this task, it is possible that you will need to replace your heat exchanger and this is not something covered by Rinnai's warranty.
you need to flush out the rinnai. to do this you will need 4 gallons of white viniger & a circulating pump. #1 disconnect the power. #2 close both incoming & outgoing water valves under the unit. #3 conect a drain hose to the out going flush valve ( flush valves are under the unit & have brass caps) #4 connect pump outlet hose to ingoing flush valve. #5 put pump incoming hose & drain hose from outgoing flush valve in a 5 gallon bucket. #6 pour 4 gallons of vinager into the bucket. #7 open both flush valves. #8 turn on the circulating pump & let viniger pump in the incoming flush valve through the rinnai & out the outgoing flush valve back into the bucket for 45 min. #9 disconct pump from incoming side & close incoming flush valve.( don,t close outgoing vaves at this time) #10 put out going hose in empty bucket. #11 open incoming water to flush viniger out of unit. # 12 disconct outgoing hose , close outgoing flush valve & open outgoing water valve. #13 clean filter & turn on power.
II would think that the unit is going out on hil imit because there is not enough psi on the water coming in.Is this unit on well water or city?If it on well water you have run some cleaner in it every six months.L on the side of the heat or inside and there a toll free number to call talk to a tech.
you will find a master controler at a electrical lighting and hardware store you have to be specific with the model and voltage/amprage rating. they will give you a schematic with the controler. .............please rate this ........thanks