Question about Grundfos UP15-29SU/TLC 1/25 HP Stainless Steel Circulator Pump with Line Co

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

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Posted on Mar 19, 2011


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Posted on Jan 02, 2017


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Turn intermatic

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.

Aug 08, 2013 | Grundfos UP15-10B5/TLC 1/25 HP...

1 Answer

NEW Grundfos UP 15-29 SU/TLC recirculating pump operates but water only warm. Not as hot as when pump is off. What gives?

Copy following links:

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

Apr 06, 2013 | Hardware & Accessories

1 Answer

I don't understand how to set the timer on my UP 15-10-B5/TLC Grundfos circulating pump. When it is not plugged in, we have a hard time getting hot water

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.

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.

Aug 30, 2011 | Grundfos UP15-10B5/TLC 1/25 HP...

1 Answer

How do you take clear cover off to get to timer. I don't want to break it.

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.

Nov 04, 2010 | Grundfos UP10-16B5/TLC Comfort Series 1/33...

1 Answer

My 15-10SU 7p/tlc pump will not run. I am lookimg

It will probably be cheaper to purchase another pump

Jan 05, 2010 | Grundfos UP15-10B5/ATLC 1/25 HP ...

1 Answer

I am unable to reset the timer on my Grundfos UP

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.

Jul 08, 2009 | Plumbing

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