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So our trusty ideal isar boiler has started playing up. Tap hot water going to rads was first so cleaned out diverted valve lots of bits of crap fell out, like rusty lime scale.. Then thd tap hot water came on hot then went cold, checked the control thermister ok the console return ok the...

hi my ideal isar he30 pumps running constantly if the heatings on, as soon as heating switches on pump runs, turn thermostate down and pump just runs and runs, run the hot tap for a second and it stops. any help would be great tryed changing PCB and valve actuator but no joy cheers also...