Below are some of the common problems with these systems. Make sure there is no plumbing crossover when cold water mixes with hot. Ensure that the gas type and pressure are correct and the gas line is sized correctly. The beauty of a tankless water heater is its ability to provide a continuous supply of hot water. 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. If this is what you need, buy Rinnai RUR98 or Navien. For most tankless water heaters, the display with present an … Hard water, corrosion, excessive demand and improper installation all cause problems with on-demand water heaters. Depending on your tankless water heater's capacity, too many simultaneous hot water applications (such as multiple showers running) can overload your water heater. 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. Check the gas burner and does the flame rod generate sparks when the unit is turned on. The longer the pipes, further the water has to travel, more you will feel the gap. Low-flow faucet or showerhead. The air supply and specialized exhausts have a tendency to get blocked, which usually makes the device shut down. Check out the output temperature sensor; it might be broken. For example; the water got cold during the shower because the flow from the tap was below the minimum. This is not a "problem" so do not spend hours trying to find the solution or calling the “expert.”. he pilot light can go out or fail to ignite and the … If the outdoor temperature happens to be lower than 40 degrees Fahrenheit, and the tank is less than one-quarter full, it will result in a low flame. Flame Failure is generally caused by either a gas pressure problem or an electrical issue. Here’s what happened: When the first shower ended, some hot water was remaining in the pipes on the way to the shower. The temperature is set too high. Often, this issue is caused by the gas supply, so check to make sure your propane tank is full before you do anything else. However, a tankless water heater's output limits the flow rate. If you need a low volume flow of warm water you will have to first turn the faucet on with enough flow to turn on the heater. If these steps do not resolve the ignition problem, then either your ignition pack has failed or there's a bigger problem. "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. Check for the correct hot and cold water installation (make sure that lines are not installed in reverse order). Use the following articles to get help on how to troubleshoot problems on Rinnai, AO Smith, Noritz and American. Suppose a member of your household just finished showering and now it's your turn. Check the plumbing fixtures for local clogging by debris or mineral scale. The water draw is greater, and many applications are running at the same time. Unfortunately, there's no way to prevent this, but now that you're aware of the problem, you can avoid jumping in the shower until the cold water has passed. 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 … If this happens, you should reduce the demand for hot water by limiting simultaneous applications, and you may want to consider resetting your unit. 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. Ensure that the length of the venting pipe is within limits. We have a bathroom about 70 feet away from my Takagi tankless heater. Most tankless water heaters are compatible with low-flow shower heads, faucets, and aerators. Besides, the filter could also be clogged by dust or unusual stuff from the water supply. …, gas does not ignite Hello, Is the vent system installed correctly and has a proper length? This list includes some of the more common problems that people have with tankless hot water heaters, but it is not all inclusive. The most praiseworthy feature of this point of use … If venting is restricted, the computer may shut down the heater. First, inspect all vent pipes to ensure they are connected properly and free from puncture holes. If this is the case, adjust the maximum temperature between 125 and 130 degrees Fahrenheit. Check if the burner is burning the gas with the clear, light blue flame. provide a means for us to earn fees by linking to Amazon.com and affiliated In this case, the fan motor runs for some time to force the exhaust gases out through the vent system. They are expensive, efficient, environment-friendly, have the advanced technology, could display an error code, but can also fail and cost you a lot to fix. Some may have a different size or thread type; 3/4" NPT, 1" NPT. 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. Extreme care should be used at all times to avoid contact with energized components inside the furnace. 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