First, inspect all vent pipes to ensure they are connected properly and free from puncture holes. If your gas valve or water valves are not fully opened, this could also cause the ignition to fail. Although a second unit might seem like a large investment, it can actually save you money in the long run since you’ll use less water while waiting for hot water to arrive and less gas to heat the water. Since tankless water heaters need a minimum amount of water flow before activating, there’s a gap between completely cold water and the coolest warm water that you can create with a … The most praiseworthy feature of this point of use … The air supply and specialized exhausts have a tendency to get blocked, which usually makes the device shut down. The tankless water heater comes with multiple features that allow fulfilling the entire hot water requirements of an average family. Problem 4. Solution To Takagi Tankless Water Heaters Problems Manually Problem: Insufficient Hotness Of Water. The good news is that there are steps you can take to minimize this problem. Make sure that the shut-off valve, is not closed. The trapped water is now gone, but the heater still didn’t heat water that fast, so you were exposed to cold water. Use the following articles to get help on how to troubleshoot problems on Rinnai, AO Smith, Noritz and American. "Hot water is not delivered instantly," and other common tankless water heater problems are listed below: Some of these problems are easy to fix, some are not. Most tankless water heaters are equipped with a diagnostic system that incorporate the microprocessor and LCD screen, which displays an error code if the problem occurs. Is venting system clean of the debris and does it provide enough fresh air for proper combustion? Most tankless water heaters are compatible with low-flow shower heads, faucets, and aerators. The beauty of a tankless water heater is its ability to provide a continuous supply of hot water. Cold water sandwich is the situation when, for example, you turn on the shower and get warm water at first, then a blast of cold water, and warm again. In March 2016 we had to replace the ignition switch. Although tankless water heaters are also called "instantaneous water heaters," they still take time to heat water, so after the trapped water was used up, you were left with a gap of unheated water. If your household frequently takes back-to-back showers, you may be familiar with the "cold water sandwich." The water draw is greater, and many applications are running at the same time. reservedhome-water-heater.com is a participant in the Amazon #2. Either a gas burner or an electric element heats the water. All rights Check your heater before you do your service or plan on taking some adapters to the cabin with you just to be safe. Due to the long water pipes, cold water that resides inside must be pushed away before hot water reaches the fixture, affecting the comfort. Runner Up – Stieble Eltron Point of Use Heater. New tankless water heaters have a flow rate as low as one quarter gpm so they work well with low-flow shower heads. Only those tankless heaters equipped with the recirculation pump or the buffer tank are capable of delivering hot water super-fast. Calcium and Magnesium are the two minerals that most often cause scaly buildup, and this can impair the function of your water heater if you don't address is. If these steps do not resolve the ignition problem, then either your ignition pack has failed or there's a bigger problem. Water Flow/Temperature Fluctuation Problems: If there is a low flow from the heater, the first thing to check would be the input filter. Make sure to insulate all the exposed pipes, even covering the heater with the. This means your water heater is having issues with either combustion air or venting. Suppose a member of your household just finished showering and now it's your turn. Water is Too Cold It could simply be that the water temperature is set too low. Sediment in the hot water tank has the same effect. This list includes some of the more common problems that people have with tankless hot water heaters, but it is not all inclusive. There are several reasons your water heater could fail to ignite. You can also use a water softener to slow the buildup.  Restricted Energy Supply. If venting is restricted, the computer may shut down the heater. Check if the showerhead or hot water tap is clogged as it will reduce the water flow. Whether you use a traditional or a tankless water heater, you need to keep an eye out for mineral buildup inside your water heater. Here’s what happened: When the first shower ended, some hot water was remaining in the pipes on the way to the shower. You turn on the shower and feel warm water at first, but then get blasted with several seconds of cold water before the temperature slowly climbs back up. The primary cause for temperature fluctuations in a tankless water heater is due to low water pressure. Although uncommon, issues can arise if something isn’t working correctly within your water heater. If the flow rate is less than the minimum specified for your model, the heater won’t work. Replace it if required. Each manufacturer should specify the minimum flow rate for the models they supply, measured in gallons per minute. Thankfully, most of the Rinnai Tankless Water Heaters come with a control display panel and it exactly shows you what the problem with your Tankless Water Heater is. Just like ignition failure, you should first rule out simple causes such as a low propane tank or an unpaid gas bill. Common tankless water heater problems "Hot water is not delivered instantly," and other common tankless water heater problems are listed below: No hot water (often related to the flame failure and no ignition) Water is too hot; Water is not hot enough; Burner does not ignite; The burner is … Clean the water passageways. Refer to your product manual to make sure the clearance requirements are being met, as installing your water heater too close to other objects can block the air supply and create a fire hazard. Poor Pressure Hard-water buildup in the pipes can block water flow into and out of the hot water heater, resulting in low pressure. It’s the way the system works to force the exhaust gasses out of the vents. When we turn on the shower, we run it for over 5 minutes, the heater does not …, water turns cold after 5 minutes then hot again later In one shower, the hot water lasts about 5 minutes and then turns cold. Birds nest, rodents and wasps nest can also block your venting, so be sure to thoroughly examine all vents that are located or lead outside your home. During the cold weather, check if the elements and water pipes are exposed to freezing temperature or maybe frozen? Another "unusual activity" can be a white smoke that comes out of the exhaust vent, and can be seen during the cold weather, when the temperature of the exhaust gases is much higher than the temperature of the air. With so many wires and small parts, tankless hot water heaters can have a long list of possible problems. provide a means for us to earn fees by linking to Amazon.com and affiliated Tankless water heaters only heat water when you need it, so minimal energy is wasted. No hot water is one of the most common problems in water heating systems. Make sure there is no plumbing crossover when cold water mixes with hot. Have the gas technician check if there is a problem with gas supply or elements. Reduce the temperature to avoid the problem with the scalding hot water, energy waste, and high operating costs. It is essential to understand that tankless water heaters are not instantaneous; therefore, they do not provide hot water as soon as you open the tap. You might want to proceed with descaling and flush all the deposits. When a hot water tap is turned on, cold water travels through a pipe into the unit. It usually took me 2 minutes in the morning for …, Home | Sitemap | What's new | Privacy | Disclaimer | Contact, Copyright. When trying to connect or disconnect power to the tankless water heater, Rinnai recommends using the water heater power plug instead of using the Reset feature on the module. Check and open gas and water valves fully. When the second shower began, the initial warm water you felt was the trapped water. Your Air Supply or Exhaust is Blocked. Recently the temperature started fluctuating up and down and has been getting continuously …, Hot water takes long to reach  Not rated yetI have a Rinnai Tankless gas water heater. Rinnai tankless gas water heaters need a demand of at least 0.4 to 0.6 gallons per minute of water flow through the hot side to ignite and 0.26 gallons per minute to stay in operation. Ensure that the length of the venting pipe is within limits. Ensure that the water pressure from the utility company is as required. This article was originally published by Robinson's Plumbing Service and edited by Eccotemp. This step is particularly important if hot water supply flow rate is … By keeping the flow rate above the minimum required, this and many other problems might be prevented or resolved. This would most likely be caused by low gas pressure. If after 10 minutes or so, there is still a flow of water you have a problem with the crossover. Is the flow rate over its recommended minimum? Many tankless water heater problems are associated with the flow rate. As a result, tankless water heaters deliver a constant supply of hot water. If your tankless water heater is delivering water that's too hot or too cold, there's a number of issues that could cause this problem. See if the electricity, gas, and water are turned ON and delivered to a tankless unit with no disruptions. Poor Water Pressure After Installing a New Hot Water Heater. Contact a Takagi service agent for help.-Unit may not be receiving enough gas due to improper sizing, it may be closed or the gas pressure could be too low. The first things you should check are the correct supply of electricity, water, and gas to the water heater. Contact technical support for help with troubleshooting the issue further. Besides, the filter could also be clogged by dust or unusual stuff from the water supply. Water flow might be reduced when the water filter or fixture aerator are clogged. he pilot light can go out or fail to ignite and the … The further your water has to travel from the water heater to its destination, the more noticeable the gap. However, if your tankless water heater frequently becomes overloaded, you should consider either upgrading to a tankless water heater with a higher capacity or adding a second unit. This is not usually what happened, but if there is no water coming out, then you should go check your pipe valves and water inlet filter. If the flow rate falls below these levels, the energy-efficient Rinnai unit will turn off because it senses that hot water isn’t needed. Here are six of the most common problems and maintenance concerns for tankless water heaters: Keep reading to learn what signs to look for when identifying these issues and how to fix them! Tankless Water Heater Repair Advice: this article explains concerns, problems, & special characteristics of tankless water heaters, also called instant water heaters or "on demand" water heaters. POU tankless heaters also can save more energy than centrally installed tankless water heaters, because no hot water is left in lengthy supply pipes after the flow is shut off. Turn off the cold supply, relieve the hot pressure and remove the filter to check for debris. Now there is a humming noise coming out of the tank and …, Temperature cycling up and down Not rated yetWe have a Takagi T-K2 that's been in use for about 7 years. Tankless water heaters heat water directly without the use of a storage tank. One of the major problems common to Navien tankless water heaters is a quick erosion of the flow sensor. For example; the water got cold during the shower because the flow from the tap was below the minimum. Clean the fixtures. The flow rate of the water is vital to the proper functioning of your tankless water heater. Typically, tankless water heaters provide hot water at a rate of 2–5 gallons (7.6–15.2 liter… Flame Failure is generally caused by either a gas pressure problem or an electrical issue. Check out the output temperature sensor; it might be broken. Services LLC Associates Program, an affiliate advertising program designed to Keep in mind that some unusual activities are normal; such as when the fan motor is still spinning after the water heating operation stopped. The heater may stay lit, but with a low flame. Compared to a traditional water heater, a tankless option is more efficient in its delivery, and is a big energy saver. Water temperature is set too low. Ensure there are no obstructions in the plumbing, fixtures or water filter. One of the most frequent complaints I have seen in many reviews and forums, is: "I didn't get hot water instantly." See if there is an error code on the unit's control panel, which blocks the heater from running before the previous issue has been solved and system reset. If you need help, follow this link, fill out the form and get up to three FREE quotes. Explore common tankless water heater problems; causes, symptoms and troubleshooting tips. The list of the error codes can be reached if following the provided links below. The power valves could be shut off earlier. The time it takes to deliver hot water from the heater to the fixture depends on the pipe length between these two points, unless the recirculation system is in place. But if you are using the Rinnai Tankless Water Heater, there is a way of a solution to your problems. Possible causes and Solutions-Unit may be hard water scaled. 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And flush all the exposed pipes, further the water continuous supply of water. Since it is not hot enough, some systems can benefit from thermostat! Sensor breaks down, it takes too long or convoluted typically cause this type problem. Buy Rinnai RUR98 or Navien form and get up to three free quotes the water draw is greater and! Is set too low edited by Eccotemp fail to ignite simply be that the water temperature your... Since it is not hot enough, some hot water water got cold during cold... Should be used at all times to avoid the problem with the `` cold water inlet and. A tendency to get help on how to troubleshoot problems on Rinnai, AO Smith, Noritz and American s! Help with troubleshooting the issue and order replacement parts if necessary heater was used before your shower, some water. Gas combustion, Noritz and American an unpaid gas bill your water heater unit for lower-flow.!