l know you guys will say look in references,but l just want to double check with you.l have just brought a new extractor fan for the bathroom with a timer.l have three wires yellow, blue, red,correct me if l,m wrong.Red to fan live,blue to neutral, yellow to L1 is this correct.Also does L1 and the letter T in the fan wiring mean the same, and what would happen if l got red and yellow the wrong way round.