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wires where marked when i removed it but on removing it have found out i have 2 reds ,2 blacks .and 2 earths only three terminals on homexpert on sunvic 2 red wires had there own terminals the 2 blacks shared one termina the earth i know what to do withl

my homexpert has letters a x b y c no numbers sorry to be a pain

thanks but can you tell me what couler of wire goes to witch one i have two reds a black and the earth the earth i know where to put

i want to replace a sunvic tlx 2259 with a homexpert thr840duk but cant work out the wiering i have two red one black and the earth can some one help me with how to wire this up i am running it on oil heating thanks