If after 10 minutes or so, there is still a flow of water you have a problem with the crossover. No injuries have been reported. The popoff valve was pouring water on the ground like it was a garden hose. Extreme care should be used at all times to avoid contact with energized components inside the furnace. It's been going on for about a day now. Good morning. Some of those problems create situations where hot water unexpectedly shuts off. Is there any simple troubleshooting for this problem? They are either natural gas or LP gas (propane) fueled. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. Contractor's Assistant: How long has this been going on? 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. Incidents/Injuries: Rinnai has received 11 reports of carbon monoxide leaking from the furnace. All of the sudden yesterday, I noticed a big puddle in the yard. Gas furnace keeps shutting off...driving me nuts. I also just replaced the batteries in the thermostat...twice. 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. I turned off … And how severe is the problem? 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? It has a electric igniter that is working. It works fine most of the time. 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. ... Use the following articles to get help on how to troubleshoot problems on Rinnai, AO Smith, Noritz and American. 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. I have a gas furnace that is about 18 years old. Insurance company paid for a replacement, and we had a Rinnai RUC98i installed about a month ago. When they’re not, they will eventually develop problems. I reset the on/off switch and after about two minutes, the water gets cold. Description: The recall involves Rinnai EnergySaver™ Direct Vent Wall Furnaces, Models RHFE 431 and RHFE 556. Rinnai Tankless Water Heater Troubleshooting Manual WARNING There are a number of live tests that are required when fault finding this product. We’ll dive into a list of reasons why a tankless water heater may unexpectedly shut off. So don’t just sit there and shiver. But for now, let’s look at two major installation and maintenance causes for the off-and-on hot water phenomena. Open all the hot water taps. But a furnace that keeps shutting off every minute or two won’t heat your house properly. Everything ran fine (just like our old QuietSide did) right up until today. 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. We've taken multiple loooong showers over the last month without issues. Shut off the cold water to the heater. Normally, your gas furnace should cycle on and off 3-8 times hourly, maintaining a comfortable temperature in your home. I've got a Rinnai tankless water heater that keeps tripping offline. The flame sensor is also working and was recently cleaned. Starting today, the unit is turning off mid-shower for no apparent reason. Not only that, it may be signalling a bigger problem that you need to take care of. 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