Green ' gunge ' on pipework.

[Bp89]

Can anyone explain what is happening to the pipework in a relatively new boiler in the attached image?

 

[ShaunCorbs]

Fibre washers leaking needs a gas safe engineer with two Worcester fibre washers

 

[Bp89]

Fibre washers leaking needs a Registered Gas Engineer with two Worcester fibre washers

Thanks. Would this account for the blue power light flashing after seven or eight hours of heating and after resetting the heating is fine again for some hours?

 

[ShaunCorbs]

No this wouldn’t sounds like you have a sticky timer or miss wired maybe needs investigation