I've got a Rinnai tankless water heater that keeps tripping offline. I reset the on/off switch and after about two minutes, the water gets cold. 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. So don’t just sit there and shiver. 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. Extreme care should be used at all times to avoid contact with energized components inside the furnace. 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. Starting today, the unit is turning off mid-shower for no apparent reason. When they’re not, they will eventually develop problems. Not only that, it may be signalling a bigger problem that you need to take care of. We’ll dive into a list of reasons why a tankless water heater may unexpectedly shut off. Contractor's Assistant: How long has this been going on? All of the sudden yesterday, I noticed a big puddle in the yard. Incidents/Injuries: Rinnai has received 11 reports of carbon monoxide leaking from the furnace. Normally, your gas furnace should cycle on and off 3-8 times hourly, maintaining a comfortable temperature in your home. I turned off … Some of those problems create situations where hot water unexpectedly shuts off. ... Use the following articles to get help on how to troubleshoot problems on Rinnai, AO Smith, Noritz and American. Is there any simple troubleshooting for this problem? 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. Good morning. First, it is important to realize that a furnace which is “short-cycling,” as we call it in the business, probably means that its safety features are working properly, so breathe a sigh of relief. I have a gas furnace that is about 18 years old. I also just replaced the batteries in the thermostat...twice. The flame sensor is also working and was recently cleaned. The popoff valve was pouring water on the ground like it was a garden hose. It has a electric igniter that is working. No injuries have been reported. 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. It's been going on for about a day now. But a furnace that keeps shutting off every minute or two won’t heat your house properly. And how severe is the problem? It works fine most of the time. Gas furnace keeps shutting off...driving me nuts. 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? Everything ran fine (just like our old QuietSide did) right up until today. They are either natural gas or LP gas (propane) fueled. Shut off the cold water to the heater. Insurance company paid for a replacement, and we had a Rinnai RUC98i installed about a month ago. Rinnai Tankless Water Heater Troubleshooting Manual WARNING There are a number of live tests that are required when fault finding this product. We've taken multiple loooong showers over the last month without issues. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. Open all the hot water taps. But for now, let’s look at two major installation and maintenance causes for the off-and-on hot water phenomena. 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