Ravenheat Central Heating System - Whilstles when heating on

Alias_Omega

As title,

Comes and goes, tried bleeding and all good. Not tried a bleed with the cold feed on yet.

Any ideas before i start pumping more water round the system.

johnoz

Is the whistle coming from the thermostatic radiator valves?

Alias_Omega

When we lie in bed, we can hear is whistling, unsure where its coming from as its been doing if for abit.

Might cold water bleed them today (close outlet, and bleed, then close inlet and bleed) to try to clear any air.

Sometime ago, the bathroom radiator would never work, no heat getting to it. Air was trapped in the pipes, and cleared it this way.