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Try RS RS Stock No. Unit Price Goods Value Description 366-338 £2.99 DPDT PCB power relay,5A 24Vdc coil

Had the same problem with water starting off hot then going cold and then finding that I had to turn off hot water tap and waiting for several minutes before turning back on to get hot water. I also found tapping the PCB some times provided temporary fix. I Fixed the fault aproximatly 2...