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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...

Checked timer and thermo - all seem OK. With regards to the actuator head. If this can be replaced does it usually invove draing the system or can it be done without? The house is only 5 years old so would you expect it to have gone after that time ? NHBC guarantee for that just ran out...

Thanks for that. Just checked in airing cupboard. I have a black device with numbers 1,2 and 3 on it (currently set to 3) and a blue headed device with a lever sticking out of it. The lever moves very freely. The blue headed device looks like it has 3 flows into it - I take it this is what...

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...