All Brands > Rheem > Checkins > Repair. Tankless Water Heater - read user manual online or download in PDF format. The small tank water heater provides you with hot water while your tankless unit’s heat exchanger warms up. The next step should be to clean the intake of the water heater. Tankless. Most of the problems with a Rheem gas water heater will be related to the FVIR lockout. Tankless Gas Troubleshooting Manual SVC 820 Mid & High Efficiency Platform . Problems and solutions vary based on the type of water heater. There are a lot of potential problems that can occur if your tankless water heater freezes. Fixing tankless water heater problems No hot water. The purpose of this manual is twofold: it serves as a training tool as well as a troubleshooting manual for qualified installers and service technicians. With most models your first step should be to press the TCO thermal reset button which is located on the front of the combustion door. Pages in total: 36. Rheem water heaters are constructed to provide many years of operation. Issues which can cause a lack of hot water include a lack of electrical power, using too much hot water or the temperature pressure relief valve discharging too much water. Even indoor units are prone to freezing, especially if they are located in a basement or a garage. A high-quality tankless water heater should last 20 years, but it must be properly maintained. Common problems with a Rheem water heater include a lack of hot water and incorrect water temperature. Hard water (leading to mineral build-up), corrosion, excessive demand, and improper installation can all cause problems with on-demand water heaters. View and Download Rheem RTG2-42 troubleshooting manual online. If you get that “hot water, cold water, hot water” surprise, consult a professional to see if you should combine your tankless unit with a “mini” tank water heater. Make sure that the shut-off valve, is not closed. in Water Heaters Even the best tankless water heaters sooner or later may stop working or be affected by other kinds of problems. Tankless Water Heater Troubleshooting Tips . Rheem is highly recognized for providing top quality residential and commercial water heaters. Technical Support (800)-432-8373 www.rheem.com Also for: Rtg53, Rtg66, Rtg74, Svc 810. They come in a wide range of sizes and capacities, are designed to deliver hot water quickly and are very energy efficient. Rheem Manufacturing ranks as the global leader in the manufacture of high-quality, sustainable, and innovative water heaters, tankless water heaters, air conditioners, furnaces, pool heaters, and HVAC systems for residential and commercial applications, and is a full member of AHRI, the Air-Conditioning, Heating, & Refrigeration Institute. The first things you should check are the correct supply of electricity, water, and gas to the water heater. 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