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Please bear with me as I am after some advice. Our central heating system is no longer working as it should. Only some of the radiators are warming up to an acceptable level, some are 'lukewarm' while others are stone cold. My initial thought was a faulty pump as I am pretty sure I used...

Forgive me as I am a complete diy novice. My central heating system only works if the immersion tank is also being heated. Have a boiler in the garage which fires when the immersion is heating. Thermostats all click when they should but no heat to the central heating. One thing I notice is...