Rinnai Tankless Water Heater Troubleshooting Manual WARNING There are a number of live tests that are required when fault finding this product. Is there any simple troubleshooting for this problem? When they’re not, they will eventually develop problems. The flame sensor is also working and was recently cleaned. 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. 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. 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? 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. All of the sudden yesterday, I noticed a big puddle in the yard. Extreme care should be used at all times to avoid contact with energized components inside the furnace. 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. I've got a Rinnai tankless water heater that keeps tripping offline. So don’t just sit there and shiver. If after 10 minutes or so, there is still a flow of water you have a problem with the crossover. I turned off … But for now, let’s look at two major installation and maintenance causes for the off-and-on hot water phenomena. It has a electric igniter that is working. 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. And how severe is the problem? Good morning. Open all the hot water taps. Shut off the cold water to the heater. I also just replaced the batteries in the thermostat...twice. ... Use the following articles to get help on how to troubleshoot problems on Rinnai, AO Smith, Noritz and American. I have a gas furnace that is about 18 years old. 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. 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? But a furnace that keeps shutting off every minute or two won’t heat your house properly. The popoff valve was pouring water on the ground like it was a garden hose. I reset the on/off switch and after about two minutes, the water gets cold. Incidents/Injuries: Rinnai has received 11 reports of carbon monoxide leaking from the furnace. It works fine most of the time. 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. Everything ran fine (just like our old QuietSide did) right up until today. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. Normally, your gas furnace should cycle on and off 3-8 times hourly, maintaining a comfortable temperature in your home. We've taken multiple loooong showers over the last month without issues. No injuries have been reported. They are either natural gas or LP gas (propane) fueled. 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