Hot water recirculating pump fail?
So I have a Grundflos UP 10-16 PM recirculating hot water pump and system that has worked well for 7 years. But no more. Hot water in the shower stopped. I switched the Grundflos off ‘Adapt’ to 100% and thought it was working but only for a few minutes then cold water I switched it to temperature control and same thing.
So I am not sure how to trouble shoot this. A new pump is $408 and a week away. Any ideas?