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