Please can someone help - I am trying to re-use the Randall TP5 on my old central heating system to control my new Greenstar Jnr 28i. There are two 1.5 volt batteries in the unit, is it possible to use without attaching mains - using 2.5mm cable already up to boiler controls? or do i need to mains power it somehow?
Bit confused? regards Tom
Bit confused? regards Tom