40 Model Comprehensive
Troubleshooting Guide
Eccotemp Systems, LLC
315a Industrial Rd. Summerville, SC 29483
www.eccotemp.com
1-866-356-1992
After verifying that your water heater has power going to it, you can check the internal wire connections. First, unplug
your water heater from the electrical outlet. After doing so, remove the cover by taking out the four screws on the front
which hold it in place. On the indoor models the digital display is attached to the cover, so please be careful as to not
damage the connections. Once the cover has been removed, check the wire connections throughout the water heater to
make sure everything is plugged up and secure. If it looks like there is a build-up of corrosion, unplugging and re-
plugging the connections verify they are correct. Note: the computers are interchangeable between the indoor and
outdoor models. The main difference is that the indoor models connect directly to the computer board and the outdoor
models connect to a set of green wires coming from the computer board. On the 40HI, there will be a green wire that is
not connected to anything and on the 40H there will be a wide white ribbon wire that is not connected to anything. This
is perfectly normal.
Lastly, if you then test your water heater and it does still will not come on, you will need to remove the computer board
and check to make sure the fuses are intact. Again, make sure that you have unplugged the power cord so there is no
electricity going to it. Inside, there is a grey box that is located near the top right. Remove the two screws from the front
of the board and it will slide out freely. On the computer board you will see two rubber boots which cover and protect the
fuses. Pull these boots off and, if the fuses are still in working order, there will be a thin wire that is visible inside of them
and should not be broken. If the wire is broken, you will need to replace the fuse.
If these steps do not fix your issue, please call technical support at 866-356-1992.
40H/HI is displaying set temperature, but will not come on:
This means that your
water heater is not seeing that there is water flowing through it. The most common reason for this
is low water flow. To determine if this is the case, turn on two faucets and see if your system turns on. If this works, you
probably have clogged filter screens. Check all of the filter screens in your faucets to see if they have become clogged
over time. If you remove the filter screen from a faucet, turn on the hot water at that location, and the system runs, you
can always just not reinstall the screen and use the faucet in this manner. Next, check the filter screen that is in the
water heater itself. There is a drain plug where the inlet water pipe enters the water heater. There is a screw located on
the front of the plug, inside of it. Do not try to loosen or tighten this screw. The entire drain plug will unscrew and can be
removed. Once removed, you will see a filter screen with a magnet in the center of it. If dirty, they can both be cleaned
by gently using a wire brush. If you need a new filter screen, you can order one from our website at
www.eccotemp.com
.
Lastly, you will need to check your flow sensor to verify that it is working properly. Go to the 40H and 40HI
Troubleshooting section on the forums page. This is located at
https://eccotemp.zendesk.com/forums
. You will find a
Flow Sensor Installation Guide which will help in completing this task. Follow the instructions in the guide to remove the
flow sensor. Once removed, you can blow through the flow sensor to verify that the impeller inside of it is spinning freely
and there is no debris inside of it. Reinstall the flow sensor as the guide instructs and test the water heater.
If these steps do not work, please contact technical support at 866-356-1992.