Grundfos SQF 200 controller

[liteguy1]

Hello All,

Today I experienced that my pump continues to run even though the relay on the SQF 200 gets turned off. I'm thinking this is a circuit board issue. Anybody else experience this syndrome/thoughts?

[Mike90250]

Can you actually hear the relay click ? If you can't, and used to be able to, the contacts may be stuck.

[liteguy1]

Can you actually hear the relay click ? If you can't, and used to be able to, the contacts may be stuck.

I will give it a listen tomorrow and report back.

[inetdog]

I will give it a listen tomorrow and report back.

If the contacts are stuck, it may be the result of overloading the relay, or it may just be old age. For a sealed (ice cube) relay, a common way of checking for this and making a temporary fix is to gently (or less gently but do not break the circuit board) tap the relay case with the handle of a screwdriver at a time when the relay should be off (like with the power removed from the controller). That may free up the contacts.