[Leisure Time Larry]

I'm a little confused by your write up, but let's see if we can figure it out. It sounds like you could have an issue with your water pathway and valving. Let's first make sure that water is making it into the water heater and that your valves are turned properly for "normal" mode and not "bypass" mode. Water should be able to flow into the water heater. You can make sure it is by opening the pressure relief valve from the outdoor access panel of the water heater while the water pump is on or if hooked up to city water. If water is properly filling the tank, it should overflow out of the pressure relief valve. If not, then that is the first problem. If the water heater is not properly filling, then the heaters may fault.

Next, make sure that the valve that would allow water to bypass the water heater is properly closed. Water should be flowing into and then out of the water heater on to the rest of the hot lines. If the bypass is also open, water may still flow to the water heater, but cold water will also flow past the water heater and into the hot lines downstream. That could be why you are getting cold water at the faucets.

Check any other areas that might allow the HOT and COLD water supply sides to mix, such as an outdoor shower where the hot and cold faucets are turned on but the shut off valve at the head is closed.

There should be a 12v fuse for the water heater in the panel along with your other 12v fuses.

Good luck!