Before I go and do this I thought I'd ask here. My pump seems to be making a bit of a racket whilst the system is warming up - the noise gets less once the house is warm.
The pump is running at it's slowest speed. Is it safe to crack it up to 2 or 3 to see if that gets rid of the noise or am I likely to get burst pipes or rads with the increased water flow.
Sorry for what looks like a completely basic question.
Thanks.
Dave.