Contractor's Assistant: How long has this been going on? Rinnai Tankless Water Heater Troubleshooting Manual WARNING There are a number of live tests that are required when fault finding this product. After it turns off, I'm able to turn it back on again pretty much right away (well as soon as I notice that it's gone out), but it's really annoying to have to keep an eye on it.. is there anything that could be the cause? All of the sudden yesterday, I noticed a big puddle in the yard. It has a electric igniter that is working. The flame sensor is also working and was recently cleaned. And how severe is the problem? Everything ran fine (just like our old QuietSide did) right up until today. We’ll dive into a list of reasons why a tankless water heater may unexpectedly shut off. No injuries have been reported. I've got a Rinnai tankless water heater that keeps tripping offline. Incidents/Injuries: Rinnai has received 11 reports of carbon monoxide leaking from the furnace. I have a rinnai tankless outdoor gas unit (the big 9.4 gpm one) anyway, it's been installed about 2 years now with no real problems. When they’re not, they will eventually develop problems. At the moment, the whole front of the heater has been taken off, so there isn't an issue with air flow through the vents. If after 10 minutes or so, there is still a flow of water you have a problem with the crossover. Description: The recall involves Rinnai EnergySaver™ Direct Vent Wall Furnaces, Models RHFE 431 and RHFE 556. Insurance company paid for a replacement, and we had a Rinnai RUC98i installed about a month ago. ... Use the following articles to get help on how to troubleshoot problems on Rinnai, AO Smith, Noritz and American. Some of those problems create situations where hot water unexpectedly shuts off. I also just replaced the batteries in the thermostat...twice. Good morning. I turned off … Bad thermocouple - it is supposed to sense the presence of a flame, and turn off the gas if it is on, but nothing is getting hot. So don’t just sit there and shiver. Last one I replaced was less than $10 at home depot, it is held in with only a screw or two, and less than an hour of work, including the beer after fixing my friends water heater. Extreme care should be used at all times to avoid contact with energized components inside the furnace. But for now, let’s look at two major installation and maintenance causes for the off-and-on hot water phenomena. It works fine most of the time. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. Not only that, it may be signalling a bigger problem that you need to take care of. We've taken multiple loooong showers over the last month without issues. They are either natural gas or LP gas (propane) fueled. Shut off the cold water to the heater. 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