Question about Grundfos Hardware & Accessories
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Posted on Jan 02, 2017
Do you have more than one zone? If so, it is difficult to tell if the circulator in question is actually running. A trick is to get a screwdriver and place the metal end on the front of the circ and the other on your ear. You will hear it if it is running. If you do hear it, is the circulator itself very hot to the touch? If it is, it may be burnt out, or the zone needs to be bled of air. Another doubtful, but possible, answer is that the circulator is installed backwards. There is an arrow on it and it should be aimed towards the flow of water.
Posted on Dec 31, 2009
I would guess that the pump is to recirculate hot water so you have nearly instant hot water. The pump should be set to run during periods of high use. I doubt that pump is wired into water heater controls. I would check setting on heater thermostat and turn up if needed. I hope this helps. Thanks
Posted on Nov 21, 2010
SOURCE: Same problem as another writer
If the pump is hot, the motor has overheated and will stop working. There's no cure for motor at this point. Be sure to de-lime and de-scale re-circulation pumps occasionally.
Return pump and exchange for new. Sounds like you already diagnosed the problem correctly.
Posted on Apr 10, 2011
SOURCE: I don't understand how to
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.
Posted on Aug 31, 2011
There is a problem with the pump but it is on y-plan system put power via the hot water satisfied front he cylinder stat. You will need to replace the timer and change the pump to old type or different manufacturers Pipinghot plumbing
Posted on May 22, 2013
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