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Hi, does anyone know how the temprature control (plastic disk with sprockets) goes back onto the body and how the red limiter button is located? On an aqulisa (white plastic controls). Thanks

Thanks Dave, will let you know outcome...cheers

Can't remember exactly - probably 18 months ago. When the DHW is on and I turn down the temp nob on the panel, the flame drops for a second then goes full bore again, unlike the ch, where I turn nob down and flame stays low.

Sorry Dave - yes ch is modulating down(the flame drops as I turn down the CH nob - is that what you mean?) , and it is a proper water softener with salt ....

Thanks for your kind reply Dave. The exchanger was replaced about 4/5 years ago because of scaling and a proper water softener was installed at the same time. I perhaps wrongly assumed that this would prevent scaling in future. Thanks again for your help. Mac

Hi there, can anyone help? The DHW on this boiler is too hot! I have followed the diagnostic flowchart and replaced the Hot water temperature sensor and the hot water overheat thermostat, but to no avail and I seem to be going around in circles! If I disconnect the wires to the modulator...