i urgently need a gas engineer to take a look at a boiler in one of my rental properties.

It appears that the boiler is dropping water from it's overflow pipe, and this is causing a rust looking mark on the wall, as well as potential damage to the brickwork and front door covering.

Note that i havent been able to get hold of my tenant to arrange a suitable time for someone to attend and fix, but i'll get this sorted asap (hopefully today , 16th Jan)

Pic attached of issue.