Wondering if anyone can point me in the right direction. Seem to large watermark near the boiler flue. Trying to figure out what’s the issue?
PS: The black pipe near the flue is an aircon pipe inside which the refrigerant pipes are there. The aircon has not been used for 3 months.
PS: The black pipe near the flue is an aircon pipe inside which the refrigerant pipes are there. The aircon has not been used for 3 months.