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Hi all I posted a few days ago with what I thought was a confroller problem. With some advise from someone on here I changed my old switchmaster for a hive mini. The hive is working fine but it hasn't fixed the original problem. My Potterton prima boiler fires up randomly when the heating/hot...

Hi My switchmaster sm400 seems to be broken. The boiler works fine on constant but on the timed function it seems to turn on and off every 15 seconds or so and makes some odd noises. I'm assuming that its time to replace the sm400. I'm hoping for a recommendation please, something I can go...