Central heating pump leaking

[happydays129]

Dear plumbing and central heating gurus,

Good evening.

I recently noticed that underfloor heating pump is leaking. The heating is working. Due to the leak, boiler pressure keeps dropping. See the photos where the rusty water dripping through.

I am wondering, for fixing the leaking, do I need to replace the whole pump or change the washers, or just use sealant? Please advice. Thanks.

 

[Mottie]

Have you tried tightening the joint?

 

[happydays129]

I am not sure how to do it. Looks so complex to me.

 

[Mottie]

I am not sure how to do it. Looks so complex to me.

Just tighten this nut up a bit if you can with some grips.

 

[happydays129]

Thanks, Mottie. I will give it a try.