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Jerry
Jerry, HVAC Technician
Category: HVAC
Satisfied Customers: 422
Experience:  Epa universal certification, hearth products specialized.
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Central heating pump leaking from inside of pump into control

Customer Question

Central heating pump leaking from inside of pump into control box tripping out power. Pump has been changed a few times now and problem keeps coming back.
Submitted: 1 year ago.
Category: HVAC
Expert:  Airheatman replied 1 year ago.
Can you provide model on heat pump that is leaking and do you have any photos to help me see where water is leaking?
Customer: replied 1 year ago.
If I disconnect the power to the pump it dose not trip. Wilo pumps
Expert:  Dales-Electronic replied 1 year ago.
Hi my name is ***** ***** I am located in the UK - are you referring to the electric box on top of the pump or in the central heating system itself? ie is the pump separate to the boiler or part of the boiler?
Customer: replied 1 year ago.
Control box on pump. Pump is on pipe coming out of boiler. There is a nrv above the pump also.
Expert:  Dales-Electronic replied 1 year ago.
Can you see where the leak is coming from?
Customer: replied 1 year ago.
It leaking into control box from the pump itself internally. I need to no why it keeps doing the same thing on all the pumps. Would a faulty nrv be causing to much pressure in the pump housing causing the problem to keep happening.
Expert:  Dales-Electronic replied 1 year ago.
How long have the pumps lasted on average? Secondly have they all been Wilo pumps?
Customer: replied 1 year ago.
Pumps last a few months. I have tried a few different ones same thing happened.
Expert:  Dales-Electronic replied 1 year ago.
Is the nrv in the flow or return line?
Customer: replied 1 year ago.
Directly above pump in flow line.
Expert:  Dales-Electronic replied 1 year ago.
In answer to your question, yes if it is in the flow line then a pressure buld-up if it were jammed or partially jamed would cause the pressure in the pump to increase to the point of splitting the seal and causing a leak.

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