FVI12-LP Intermittent Temperature Reading Tech Support Updated March 29, 2016 20:05 Follow Tech Support Hello John Smith, 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 Thanks - I am back at the beach and swapped out the sensors from my old unit and the problem is solved. You can close this case now. Tech Support Hello John Smith, Good day! I tried calling you but the number you have provided says it is in Mexico so the call cannot go through. There are 2 parts here that deals with the temperature which are the over temp sensor and the outlet temp sensor(see attached photo). You mentioned that you have an old unit. You can try swapping the sensors from there and if it works then you can purchase these 2 parts from our site. See link below. Or before you purchase, you can try the parts from your working one to this unit and see if it would resolve the issue. If it does, then you have the purchase the parts since your unit is already pout of warranty but we can give you free shipping. http://www.eccotemp.com/fvi12-ng-over-temperature-sensor/ https://www.eccotemp.com/fvi12-outlet-water-temperature-sensor/ Please let us know. Regards, Technical Support Team Eccotemp Systems LLC 1.866.356.1992 www.eccotemp.com Screenshot_53.png John Smith I bypassed the overheat sensor/switch with same results. It will turn on and heat for maybe a minute and then shut off. The temperature changes even when the unit is not making hot water. It can be off for hours and the temperature changes large increments in a matter of seconds. It is constantly changing and it doesn't matter if it is burning gas or not. Tech Support Hello John Smith , Good day! We apologize for the inconvenience. Please try these additional instructions for your FVI12-LP. 1. Bypass the over temp sensor(see attached photo). Connect the 2 wires cover with blue boots together and run the unit again if the temperature would still fluctuate. 2. Make sure the the water inlet filter is clean. The 65F is the ground temperature reading. Increase water pressure if needed. Please maintain 40-60 PSI of water pressure to sustain the unit's performance. 3. Set the water temperature knob to maximum and the gas temperature knob to minimum. If you need to raise the temperature, just leave the water knob to max and just mix the temperature with the gas dial knob. 4. Try to perform the water pressure adjustment(below link). https://eccotemp.zendesk.com/attachments/token/vkovnpzfcoips4n/?name=Pressure+Adjustment+Guide.pdf NOTE: Turn both screws clockwise until resistance is felt. Once the screws are in closed position,please turn both counterclockwise just 1/8 of a turn. Regards, Technical Support Team Eccotemp Systems LLC 1.866.356.1992 www.eccotemp.com Screenshot_46.png John Smith The temperature gauge is jumping all over the place. With the unit plugged in and no water flow the temperature jumps from the 60's to as high as 150. Frequently changing. Related articles FV112-LP owner/installation manual 40H - Water temperature drops during shower/Unit shuts off (Full Ticket) Basic Support and Troubleshooting Eccotemp Product Manuals FVI-12 E3 Code Comments 0 comments Please sign in to leave a comment.