Does the Grundfos UP15-29SU/TLC replace my old UP15-18SU with timer?

http://waterheatertimer.org/Water-heater-recirculation-system.html#lever

http://waterheatertimer.org/How-to-set-timers.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Unplug and replace.
Pumps get old and slow, and when they slow up they get hot, which damages pump more, so they get hotter until they stop working.
Copy following link for tips to make next pump last longer such as air valve, periodic cleaning with white vinegar.
http://waterheatertimer.org/Water-heater-recirculation-system.html
Gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following links:
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg

1) Bad check valve ... take apart and clean with white vinegar
2) Bad single handle faucet cartridge ... test for cross connection
3) Set timer operation instead of thermostat operation ... thermostat operation may be bad depending on location of thermostat

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Replace crossover valve located under sink
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://www.amazon.com/dp/B00128BIUU/?tag=waterheaterti-20

gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Pump can be bad or clogged with debris loosened when pipes were moved.
Check installation, and check if crossover valve is installed correctly
Check if single-handled faucets are good
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/Crossover.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Sounds like 2 problems:
1) Crossover and 2) Setting timer
Recirculation system has check valve that stops backflow of water when pump is turned off.
When check valve is clogged with sediment, or has worn out, then cold water enters hot pipe or hot water enters cold pipe when faucet is turned on.
Take apart connection where grundfos connects to both hot and cold pipes, and clean with white vinegar or CLR.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Water-heater-recirculation-system.html

Open following link for setting typical FM/1 analog timer module on Grundfos recirculation pump:
Your timer module may vary in appearance.
Slide switch selector might be located below timer dial.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg

it shoud have little button that stick out the back but not very far, try resetting it and how about a rating. thank you

If your grundfos pump is like mine, it is a sealed 1-piece unit that cannot be taken apart and repaired.
I wanted to change the timer like you but i couldn't.

The autocirc circulation pump has a built-in timer.
I looked at that model, and it doesn't come apart either.

http://waterheatertimer.org/Water-heater-recirculation-system.html

It will probably be cheaper to purchase another pump

You were able to rotate it before and you cannot rotate
it now?? Is this the situation??
Then, the programmer is stucked up. Sorry, but you may need to replace it.