![]() There is a few things that have to checked when a Rinnai gives a code 12.You can call Rinn. I've tried calling Rinnai, but all they will do is give me the numbers of certified repair techs in the area. This will be a 4 part video on the Rinnai tankless heater code 12. Does anyone else have any ideas about what could be causing this problem. I'm thinking I should try to test the temperature at the bi-metal switch as I try to recreate a code 14 (I've read it supposed to pop at 207 F) to make sure it's not malfunctioning. I also don't see any signs of overheating on the heat exchanger. Our water is pretty soft, so I don't think it could be scale in the heat exchanger. I can set the forced low fire manifold pressure on the heater just fine, but if I try to set the forced high fire manifold pressure I get a code 14 immediately (this is while the hot taps for the tub and sink are open). I've flushed the heat exchanger with vinegar, which seems to help temporarily. The gas pipe to the heater is sized properly, and I'm getting 7.8 in WC of pressure at the heater. I don't get a code 14 if I just open the hot water at the tap full blast or run the dishwasher. I also get a code 14 if our washing machine, which is around 30 feet from the heater, is set to hot or warm water. ![]() Just started today Ask an Expert Home Improvement Questions HVAC Questions Ask Your Own HVAC Question Jeffrey Towler 579 Satisfied Customers Expert Related HVAC Questions satisfied customers Andr R. n error code 12 might appear if the venting system has components not approved by the manufacturer, loose connections, or does not meet recommendations for. If I open the hot water to the tub gradually, then I don't have this problem. Rinnai energy saver 1004f fans come on but heat doent kick on shows code 12. 0:00 / 8:02 Code 12 on a Rinnai tankless checking the flame rods That Tankless Guy 14.2K subscribers Subscribe 1.4K 123K views 5 years ago This will be a 4 part video on the Rinnai tankless. If I open the hot water for the tub on full blast, which is around 5 feet from the heater, then I get a code 14 (the resettable bi-metal switch, not the one-shot fuse). The water heater has worked perfectly for the last couple years except during the winter months when the water supply gets colder. I bought it off Ebay for a steal (looks like a customer return that was never put in service) and self-installed. I have a Rinnai RC98hpe natural gas, condensing tankless unit that is heating water for our 1500sf, two bath home. Compressed air is your friend, but be careful as most valve seals are designed for a couple of PSI at most.I hope that someone can help me with this problem, because it's extremely annoying. When a unit displays an error code it usually means you need to contact your Rinnai Service Agent. Same as carby jets, you can significantly alter flow rates with a mis-placed scratch. Darren demonstrates what an error code looks like on a Rinnai Energysaver gas heater. Don't poke valves or orifices or you risk scratching them. ![]() ![]() Don't force anything and proceed carefully. When you are done, knock up a simple water manometer and do a proper leak test on the inlet just to be sure. Most bits of gas gear are able to be stripped and cleaned if you are careful. Just make sure it goes back together the same way it came apart and that everything is properly sealed up when you put it back together. If water is not equipped with the control panel, the same error code appears on the remote controller. You can see diagnostic information on the control panel, where you set the temperature. A couple of lazy hours and it was all good, and has been for the last 5 years. An error code 12 found on the Rinnai tankless water heater means ' no flame ' or a water heater didn’t recognize a flame in the combustion chamber. I stripped it down to find a small insect of some kind inside one of the valves and the igniter mechanism needing some lubrication. Have you tried resetting it and does it go right back to the '12' Hi There, My name is am one of the HVAC Experts here and I would like to answer your Question today. There can be many things that can cause this. They got a gas guy out to look at it who condemned it immediately as irreparable and Rinnai said it was 40 years old and certainly not supportable with spares. Rinnai 1004f prob My rinnai energy saver 1004f starts blinking w/ a code 11 ive cleaned it all out and after turning it on again it makes the whooshing sound like its ignited and then it shuts down with the error code again. the '12 Error code' means there was a flame failure. Flame failure may indicate the lack of gas supply, not using the proper gas type, cleaning, broken elements within the heater, and more. When I got back from overseas the tenants in my house told me the Rinnai built-in gas heater in the lounge had died. Rinnai code 12 indicates several issues within the Rinnai water heater and that there is a lack of flame or flame failure within the system.
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