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Hi, i swapped a cu yesterday and now the combi boiler wont operate off the wireless room stat. it works on advance on the boiler on still gives hot water. I did I/R reading between L-e N-E so can't be that, and rcd auto test in the board. The only thing i did was ZS from fused spur. I have tried paring the roomstat again and changing the battery's but it still wont work.