Also, the cold water is alternating between hot and cold!
I can feel the temperature change from cold to lukewarm cold to lukewarm. And this happens when the pump cycles. When you are using the cold water it is mostly cold and alternates to a little bit of warm.
When you are using the hot water, it is mostly warm, not the full heat you would normally feel, and cycles a little bit cold.
The bypass valve is working properly. It is set to just send water from the freshwater system through to the intake of the water heater. And that’s it.
The heck could cause the symptoms? Also, the flow rate is very low.