Hey,
once the rads are heated to the temp setting there is a ticking / hammering sound coming from the pipes up stairs, this starts fast then dies out, this happens every time the boiler lites.. you can here it traveling though the main pipe then loud when reaches the rads/pipes up stairs... like they are expanding or contacting everytime it lites..
once the rads are heated to the temp setting there is a ticking / hammering sound coming from the pipes up stairs, this starts fast then dies out, this happens every time the boiler lites.. you can here it traveling though the main pipe then loud when reaches the rads/pipes up stairs... like they are expanding or contacting everytime it lites..