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turn on the cold inlet vave to boiler

it also could be the plate h/exchange blocked with magnatight isolate c/h f&r valves cold water valve removw plate h/exch use a tool to bang against the plate you'll might find a load of particals inside worth trying

try isolating the flow valve under the boiler and see what happens when u turn the h/w on also check stop cock is fully on and flow rate of h/ water against the MI,s

oh and good luck with your asc if its your first time taking it the assesor may apear to be a bit pushy but if that happens dont worry it all part of the test to see if u can work under pressure.

I Know drayton has an a varity of C/H controls, I know for a fact they also produce wireless stats and transmiiters not sure on the model though here is some info I found just cut and paste this link...

I agree with u mate ive been an bg engineer for a number years and like you said it's not just because i work for them a, u get a comprehensive 1 to 4 star cover 365 days a yr 24hrs a day b, unlimited parts and labour subject to age of appliance,emergancy response c, annual service...

pls help i have a potterton time programmer that needs replacing due to short circuit in switches , when removing the front i noticed loads of wires connected to the back plate of the programmer some interlink from one terminal to another, i have a drayton ch/hw 24hr prog how do i go about...