Best answer:

Answer by ohiohillbilly
It all deals with water flow. You must have at least 1/2 gpm flowing through the heater for it to heat the water. Less than that and it will shut off and cold water flows through. This isn’t a large volume.
Solutions:
Set the temperature at 120 degrees instead of a higher temperature. This way you will have more water flowing through the system, because you will use more hot water and less cold.

Make sure the holes in the shower head are not clogged. This will restrict flow.

Pressure in the lines. If the pressure is below 40 psi, you may have problems maintaining the water flow. If you are on a public water system, this should not be a problem. If you are on a well, you may notice this as an increase in water flow when the pump kicks on. If so, increase the pressure in the pressure tank.

We have encountered all of these at one time or another with our system. Once you get it figured out, you’ll wonder why you didn’t switch sooner.

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