Heatslave 15/19 boiler - keeps kicking in?

i All,

We have a heatslave 15/19 which was fine until a couple of days ago. A guy came round from the waterboard to fit us a water meter [uck]. After shutting off the supply, and disconnecting a few joints on the cold feed, he then realised he had the incorrect meter and put it all back again to return sometime in the future. Since then, every 10 minutes or so, the boiler keeps kicking in for DHW.

The central heating is currently switched off [pressure is about 1.5bar if that makes a difference] on the front panel, and the water system is set to on perminatly. Before his visit, the boiler would come on every 2 hours or so, and also when you switched on a tap. Now, it comes on every 10 minutes or so.

Every 10 or so minutes you can hear gurgling in the pipes, and clicking noises come from the boiler as if someone has turned on a hot tap - assume this a relay triggered by a flow switch or something.

Anyway, the boiler then fires up for 30 seconds or so - during this time we get some more clicking and gurgling. It then goes off, and repeats the cycle after about another 10 mins.

The gurgeling sounds like air I guess - but I dont know where. Would air trapped in the closed rad circut cause this to happen, even with the central heating off? I have switched on all the taps in the house - there was some initial splutrering [he didn't leave the taps on when switching the main supply back on] - but thats all gone now.

I could bleed the rads, but don't have a key at the moment - don't want to waste time if it's not that.

If anyone has any ideas, that would be great.

Many thanks