My central heat makes a hullabaloo at the same two radiators downstairs almost twice aday-think its vibration but it sounds close to a Foghorn when it happens and its driving us nuts! own bled the system and no air present-only stops when turn thermostats past its sell-by date then on again- Any planning?
Answers: you need to renew the thermostat valve.air within the pump.!!!!!More Questions and Answers...