air in rads on a sealed system

8 Nov 2003
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United Kingdom
Hi, I have a Worcester Highflow which was installed in March. We recently had a leak on a rad valve, which was repaired, but the two top rads became full of air and needed to be bled. After topping the pressure up and bleeding the rads, they both came on. This may sound like a stupid question but would air have only got into to the system via the leaking rad valve?
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When the system was drained ( or did he use a freezing kit ?) air fills the system and needs to be bled out. If the guy had closed all the rad valves both sides then this minimizes the problem but they would still have air in them after a drain down.
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