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Hi could anyone help please, my elderly father has greenstar 30i boiler with wife remote controller with built in thermostat. He cant work it at all and I'm changing it to a Siemens RWB30E 24 Hour Mechanical Timer and separate room thermostat. Can anyone draw me a simple wiring diagram. Is it compatible as room stat and controller are 230v. I've read something about damage to boiler as it may be 24v. Any help would be appreciated. Paul