Damp/mould problem could it be related to proximity of boiler?

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I want advice on how to tackle this damp/mould problem. We've had this problem for over a year now.. Ive painted over it in the past but the 'black' keeps coming back. By the way we cant really smell anything. The damp/mould is behind some kitchen units near the boiler but seems to be going higher. The house is quite old (about 100 years) and there is a cellar. Pictures below with some further explanation.. anyone know how I can fix it?

Pics below with more info, summarised here

PIC 1 -
So I've removed the doors from the units here.. you can see the mould / damp
PIC 2 - This is what it looks like with the units removed
PIC 3 - Grill removed from vent
PIC 4 - moisture reading from the blackest part doesnt show any significant reading
PIC 5 - Picture of cavity (taken from inside air vent)
PIC 6- Cellar section directly underneath. In the past I have noticed some water in that hole area in. Not sure where that water comes from because it's raining cats and dogs outside today but it looks pretty dry to me
PIC 7 - Outside section
PIC 8 - Outside section top
PIC 9 - Outside section - roof


PIC 1
So I've removed the doors from the units here.. you can see the mould / damp
pxl_20210206_152004158-jpg.221829



PIC 2

This is what it looks like with the units removed
pxl_20210206_151244401-jpg.221833



PIC 3

Grill removed from vent
pxl_20210206_144042124-jpg.221834



PIC 4

moisture reading from the blackest part doesnt show any significant reading
pxl_20210206_150340550-jpg.221835



PIC 5

Picture of cavity (taken from inside air vent)
pxl_20210206_150856140-jpg.221836



PIC 6

Cellar section directly underneath. In the past I have noticed some water in that hole area in. Not sure where that water comes from because it's raining cats and dogs outside today but it looks pretty dry to me
pxl_20210206_145114427-jpg.221837



PIC 7

Outside section
pxl_20210206_144859838-jpg.221838


PIC 8
Outside section - top
pxl_20210206_144859838-jpg.221838


PIC 9
Outside section - roof
pxl_20210206_144855533-jpg.221839
 
Last edited:
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Mould is due to the result of a lack of ventilation and/or heat.
 
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Where does the tumble drier live and is it condensing or a hose vented type that is just blowing into the kitchen?
 
It's a condensing dryer and lives in the same room about 3 metres away (an L shaped room)
 

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