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hi can anyone help with the problem of my boiler i have just descaled the heat exchanger . now the spindle of the diverter valve does not actuate the micro switch for dhw. i have plenty of flow through the hot taps but not hot. the boiler does fire up if i manually trip the micro switch.

i have no hw on my boiler i have descaled the dhw heat exchanger . but now the diverter valeve does not operate the micro switch. can anyone help with this problem. thanks j