When I put my central heating on and I sit in my living room there sounds to be something dripping coming from my ceiling. The drip sound can be slow then speed up a little, then it stops only to start again. I cannot see any evidence of water on my ceiling but the noise of the drip worries me therefore I turn my heating off and the drip stops. Is this something to worry about? Can it be easily fixed as I would like to get rid of the drip sound?
My guess is that it's a vent pipe from your heating system that's resting against a part of the wood joist in your ceiling. As the vent heats up, it expands, and the expansion causes a dripping like sound as it slips and sticks against the joist. If this is the case, it will start slow when the heating cycle begins, speeds up as the hot air starts to come out of the vent, and then slow down to a near stop when the heating cycle has been going on for a while.
The same thing can happen with plumbing drain lines. I hear it all the time when the dishwasher dumps the hot water.