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Thanks. Its across most of the wall, but not beneath and pictures. If its mould, would a covering of Zinsser, followed by paint do the trick?

Got a NEST Thermostat. Replaced the Vaillant VRT350 about 9 months ago, and was work fine.

Bedroom wall is covered in grey spots, its on the outside facing wall. I though it was mould but it won't come off (used mould remover) Pic attached

I've got a Vaillant eco TEC plus 837 that is constantly has the heating on, even though the thermostat isn't calling for it. Its not coming on full but maintaining around 42 - 54 degrees.

Hi, I have an Alpha combi boiler installed 3 yrs ago, along side a load of new rads. Approximately 12 after installation, the hot water ran cold and would heat up. There were no problems with the heating. I rang the company that installed the system, they said that as the boiler...