Found a really cool tool

RayWohlfarth

I was at the supply house and found this little tool which you hold up to the rear of a Grundfoss circulator and it lets you know if its running. I loved it. I bought one for every employee, even the secretary. Not sure if it works on other circs.

Gordo

I'm not absolutely sure, but I think all that tool does is to confirm that there is AC current to the circulator stator coils. The rotor can still be locked and that gizmo will still spin.

I know. I was disappointed too.

Mad Dog_2

Yes. Had one years ago. Finally snapped off my keychain. Mad Dog

RayWohlfarth

Gordo Thats depressing It is supposed to tell rotation also but did not. Mad Dog will keep it in my tool bag Have a great Thanksgiving

Guy_Woollard

I have had a few of these as well. At least they let you know that the circulator is getting power, at which point you can eliminate the boiler control and/or relay from the troubleshooting. It narrows the issue down to a flow problem.

Henry

You can get them FREE from Grundfos

JUGHNE

They used to have the big plug in the back, you could check that the rotor was wet, crank start a stuck pump with a screwdriver and also feel with your little finger if it was rotating, (very carefully of course, don't try this at home.)

RayWohlfarth

Guy it sure beats holding a screwdriver against the circulator

RayWohlfarth

Thanks Henry
Jughne I have done that both carefully and not

burnerman_2

I have a few they give them out at trade shows Taco Too