FVI12-NG / E5 Tech Support Updated January 08, 2016 16:08 Follow Tech Support Dec 29, 2015 05:18 pm Hello John, Thank you for writing in. I would like to extend my highest gratitude towards your cooperation in resolving your issues and making our business better in achieving our goal for customer service. Your time and business is highly appreciated at Eccotemp. Have a great day! Regards, Technical Support Team Eccotemp Systems LLC 1.866.356.1992 www.eccotemp.com John Smith Dec 29, 2015 05:16 pm Thank you!! I have followed all the steps you provided and it resolved the issue. The unit now works like charm! I am a happy camper now. Thanks, John Tech Support Dec 29, 2015 04:30 pm (assign) Hello John Smith, Thank you for contacting Eccotemp Systems Help Desk. Our goal is to provide you with the best customer service possible. With that being said, please note that we have received your request and will take all steps necessary to resolve your issue. Our Phone Troubleshooting department is available Mon-Fri 9-5 PM EST. You may also reach them through chat 24/7, just visit our website at https://www.eccotemp.com/contact and select the blue Support button on the right side of the screen. (Please Read Through!) For your records your ticket number is located above. We regret any inconvenience that this issue may be causing you and please be assured that we will do what is necessary to resolve it. Please don't hesitate to contact us anytime or to update this ticket as needed. The FVI12 has an over temperature sensor to prevent the water heater from running at excessive temperatures. While in operation, if the outgoing water or internal components achieve excessive temperatures, the over temperature sensor will automatically shut down operation and the water heater will display an E5 error code. This is typically resolved by using the knob on the front of your water heater to decrease the amount of gas being used and also decreasing the water temperature knob. Overheating is also directly related to an inadequate amount of water flow to absorb the heat being generated. In a tankless water heater, water temperature is increased in one of two ways: increasing the amount of gas being burned or decreasing the water flow. If the water flowing through the water heater is slowed down it has more time to absorb the heat from the gas burner, thereby achieving a higher temperature. The water temperature knob functions by restricting the flow of the incoming water to increase water temperature. If you look at the possible settings of the water temperature knob you will notice a series of blue marks. By setting the knob at the smaller marks you increase the amount of water flow and the temperature will decrease. By setting the knob at the larger marks you decrease the amount of water flow and the temperature will increase. Water flow can easily be affected by the size of your pipes, the amount of water your faucets use, or blockages in the water lines or filter screens located inside of your faucets. If you only have an issue with overheating at one faucet, you will need to check to see if it has a dirty filter screen and remove any efficiency items which may have been installed inside of it from factory. Lastly, a faucet that does not have a separate hot and cold knobs can create issues with tankless water heaters which do not self-adjust based upon water flow. The reason for this is that there is no way to only add cold water. When you attempt to add cold water, you are also reducing the demand for hot water, so the temperature of the water heater will increase. This can also happen with faucets that have separate hot and cold knobs when you attempt to mix cold water. If this occurs consistently, you may need to set water temperature using the water heater controls and only using hot water at that fixture. The FVI12 is manually controlled, meaning that it always uses the exact amount of gas and reduces water flow by the amount the knobs are set to. Because it operates in this manner, a faucet with low water flow will run at a higher temperate than one with a higher volume of water flow. The FVI12 cannot be set to maintain an exact temperature regardless of which fixture you use. If your water flow varies between fixtures, or if it is changed while the water heater is in operation, the temperature will change accordingly. Your ticket number is located above, and will be referenced in future correspondence regarding this issue. Should this not resolve the situation, please contact us or update this ticket anytime and we will promptly respond to your needs. * If you have not done so, please take the time to register your product with us here https://eccotemp.zendesk.com/entries/23454072-Product-Registration . We appreciate and value your business. Technical Support Team Eccotemp Systems LLC 1.866.356.1992 www.eccotemp.com Related articles FV112-LP owner/installation manual FVI12NG - E6 Error FVI-12 E3 Code Basic Support and Troubleshooting Eccotemp Product Manuals Comments 0 comments Please sign in to leave a comment.