This runs perfectly fine most of the time. But if the CH is running and I flush the loo or turn on a tap, it starts making a low whiney noise. 
It will stop if I turn on a hot tap (not tried the cold one).
Is this a symptom of an air lock and if so do I have to get in a Corgi person to fix it?
Ps the pressure is fine and the radiators have been bled (not that they seemed to need it).
It will stop if I turn on a hot tap (not tried the cold one).
Is this a symptom of an air lock and if so do I have to get in a Corgi person to fix it?
Ps the pressure is fine and the radiators have been bled (not that they seemed to need it).
