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Glowworm compact 100e PCB. Can anyone tell me if the burnt area could be the reason why the hot water is only luke warm? Everything else is working fine.

I'm sure this is a classic symptom of a common fault in older boilers but would like to know what the fault is. Central Heating works fine, no probs. Hot water is very unpredictable but usually only works if 1. The heating has been on for at least 60 mins and 2. The tap/shower is only slightly...