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