Small radiator on the landing doesn't work, has a lock shield both ends, how do I know which end to turn to get things working? Both pipes in are cold, so that doesn't help identifying the feed
Open them both and see which pipe warms up first.
Consider why it's lockshields at both ends and isolated. Be ready with towels and spanners
@Grumpy_Git started
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Small radiator on the landing doesn't work, has a lock shield both ends, how do I know which end to turn to get things working? Both pipes in are cold, so that doesn't help identifying the feed