Flog through one step at a time, thinking logically.
It LOOKS like - on the basis of what I understand at the moment - that there is a problem around the bit that says "Continuity across DHW flow microswitch terminals and PCB - A5 connector terminals 5 & 6"
Read and think.
I can answer this question...
Baxi 105HE - Heating comes on with water?
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