ARISTON MICROGENUS 23 & 27 MFFI CONTROL KNOB 998603 - BRAND NEW - FREE POSTAGEARISTON 998603 CONTROL KNOB. Product Information: The control knob resides on one of the spindles located on the front of the control panel and allows the user to manually control certain aspects of the appliances operation. Some boilers enable you to change temperature and some even allow you to change the current function. This means the user can have the boiler provide hot water without the central heating being on and vice versa. This part is

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Some boilers enable you to change temperature and some even allow you to change the current function

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he printed circuit board or ( pcb ) is the control centre of the appliance

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