watts premier hot water recirculation system installed, cold water stops flowing!

[Benjamin S]

watts premier hot water recirculation system installed, cold water stops flowing from back master bathroom cold faucet several times a day. Any clue what is the issue and how to fix it? TIA

 

[MicEd69]

I'm betting you do not have a dedicated return line for the circulating system and have a sensor valve like below that uses the cold-water supply line to the master bathroom as the return circulating line to the water heater.

I would guess either this valve or a check valve in the system has malfunctioned.

Pictures around the water heater, circulating pump, and under the master bathroom sink would help. Also, a sketch of the watts premier hot water recirculation system woud help.