Grundfos Home Booster will not turn off!

[tsm22]

Hello All,

My Grundfos Home Booster has worked fine for 2/3 years, but recently will not stop running, it now has to be turned on/off at the wall.

It is set to 3.6 Bar with a 2 Bar differential and all other settings are auto/as it came. But the panel on the front always says 5.5 Bar...have tried setting the pressure below 3.6 Bar, but the pump always happily tells me it can do 5.5.....

Thanks All.

 

[studips]

painfully expensive pieces of kit these.

if the pressure was indicating correctly i'd go for a faulty flow switch or a leak keeping the flow switch on.

sounds more like your pcb has got itself fried. have you powered down, whipped the case off and checked for leaks/water stains etc?

be a good idea to ring grundfos technical support. they should be able to help nail the problem.

 

[tsm22]

Just had the engineer round, as you said pcb.
He guessed that there was a stuck relay.

But as the controller has space for two pumps (the unit only having one) we are now running on 'B' side, so no cost!

 

[sjr42]

Got the same problem and just seen your post. What does the 'swap' to B involve. Do you need an engineer or can this be done yourself?