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