FVI12 Comprehensive Troubleshooting Guide
Eccotemp Systems, LLC
315a Industrial Rd. Summerville, SC 29483
www.eccotemp.com
1-866-356-1992
E3
An E3 Error indicates that the water heater has overheated, meaning it reached very high temperatures and shut itself
down so as not to cause damage or harm.
The reason a 40H/HI can overheat is because the temperature is set too high, the water flow is too low, or a combination of
the two factors. If your temperature is set higher than 120F, set the water heater to 120F and try to operate it as usual.
Lastly, if this is specific to one or two faucets only, check the filter screens in the faucets and free up your water flow as
much as possible.
If your water heater is going directly to an E3 and not trying to ignite, or if the steps listed above do not fix your issue,
please contact technical support at 866-356-1992.
E5
An E5 error code indicates that there is an issue with your fan or venting.
If your fan is coming on, but then giving you an E5, you most likely have a blockage in your venting. This mostly pertains to
the 40HI as the 40H models vent directly out of the front of the heater. Check inside of your vent pipe to make sure there is
no debris blocking the flow of air.
If your fan is not coming on, then you have an issue with voltage or there is something that is not allowing the fan to spin
freely. A common solution for this is to first unplug the water heater from its electrical supply. Next, remove the cover by
unscrewing the four screws that hold it in place. The indoor mounted 40HI models have a ribbon cable connecting the
display to the computer board. Please be careful as to not damage this wire. You will need to disconnect it using the black
connector located 6 inches from the display itself.
