Ch pump leak, condensation?

[Ron burgundy]

Fitted a new grundfos upso pump to my baxi 105 due to leak into control box tripping rcd.

Easy job, screws were easy to get out and it came straight off. Fitted new pump but it's started dripping(slowly) from where the head joins the housing. I took the pump off again and smeared a bit of fernox paste on the seal. Still leaking... I took the rubber seal off and replaced, still leaking. Could this be condensation or am I missing something.. the pump body housing isn't warped.. still using the boiler as it only drips every half an hour but obviously needs fixing. Anyone got any ideas.. is there a drain hole I'm missing for condensation on the boiler housing where the pump fits. Why is there a channel before where the rubber pump seal seats?.

Many thanks for any comments good or bad

 

[fixitflav]

Fitted a new grundfos upso pump to my baxi 105 due to leak into control box tripping rcd.

Easy job, screws were easy to get out and it came straight off. Fitted new pump but it's started dripping(slowly) from where the head joins the housing. I took the pump off again and smeared a bit of fernox paste on the seal. Still leaking... I took the rubber seal off and replaced, still leaking. Could this be condensation or am I missing something.. the pump body housing isn't warped.. still using the boiler as it only drips every half an hour but obviously needs fixing. Anyone got any ideas.. is there a drain hole I'm missing for condensation on the boiler housing where the pump fits. Why is there a channel before where the rubber pump seal seats?.

Many thanks for any comments good or bad

Sounds like you just replaced the motor. It's usually an O-ring seal, if so it's worth smearing it with silicone grease. I assume you've cleaned up the mating surfaces.
If all else fails you could replace the pump body. Last one I did the price for the motor only was the same as the whole pump, so a no-brainer.

 

[Ron burgundy]

Hi, no I changed the body. Thanks for the advice though.

 

[fixitflav]

Hi, no I changed the body. Thanks for the advice though.

Reference to the screws made me think you'd just removed the motor. If you fitted a complete pump, isn't it a faulty unit? You wouldn't normally expect to separate the motor, just fit the whole thing. Less I'm missing something.

 

[Ron burgundy]

It's in a baxi boiler, you take 4 screws out and replace the pump head which fits onto the volute.

 

[fixitflav]

It's in a baxi boiler, you take 4 screws out and replace the pump head which fits onto the volute.

That's what I thought. So by body in #3 you mean the pump head?
Is it an O-ring? Replacing that might do it, if a new one didn't come with the new head.

 

[Ron burgundy]

It's brand new head, I already stated I put a another new seal on just to make sure , still leaking

 

[fixitflav]

It's brand new head, I already stated I put a another new seal on just to make sure , still leaking

Perhaps some red Hermetite or similar on the seal. Stops most leaks