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Mar 6, 2021
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London
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DIY or Homeowner
Hi all!

Went to stick the underfloor heating on and the pump started making a weird noise and the first red LED and the last amber LED are on - which per instructions means that the pump is blocked and it is necessary to deblock the shaft. It has a deblocking screw in the centre of the control box so I push it down and turned it counter-clockwise multiple times and I can hear it turning so the shaft shouldn't be blocked. But when I turn the system back on it goes into the same error mode.
I even tried to give it a a few love taps with a rubber hammer - anything else I can do, besides calling the engineer to have a look?

The pump is also a new one having been installed back in March this year, so I doubt any sludge is in the pump yet.
Worth mentioning that this is the first time we have switched the heating on for at least 5 months.
 

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I had the same issue. I found the anti clockwise turn alone wouldn’t clear it. I isolated the flow and return, switched off the power and then tapped the screwdriver with a hammer whilst turning. I then switched it on with the flow and return still off and it started again. Then turned the flow and return on and all working.
 
I had the same issue. I found the anti clockwise turn alone wouldn’t clear it. I isolated the flow and return, switched off the power and then tapped the screwdriver with a hammer whilst turning. I then switched it on with the flow and return still off and it started again. Then turned the flow and return on and all working.

I had the same issue. Tried turning anti clockwise multiple times but it didn’t work. Then found Jon’s advice, tried that and it worked first time. Thank you Jon!
 

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