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Hi All. I have an old TS500 which gave up and am looking to replace the control panel , keypads and the old PIR's . All wiring is in place and would also prefer hardwired. I am a competent DIY'er and can do most things, so really want to have a go myself. I would like your...

Whats that noise? http://www.youtube.com/watch?v=pmGv1d6_ijc It is fitted as part of a system with a megaflow and 2 honeywell zone valves controlling the CH and Megaflow on the same circuit if that makes sense? It doens,t appear to be the pump having checked while running with a steth...