Is your Isolation valve from the hot water tank missing a handle/a tap? This is a common issue in homes than you think especially for first time home owners who just recently moved house.
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Isolating Valve Replacement Handle
First, you should isolate and drain the inlet piper before cleaning the filter.
The next step would be getting an actual replacement handle. But, beware, not all brands of handle will interchange successfully with different valve bodies. Try using an adjustable plier, grips or spanners in that case.
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If it doesn’t move in one direction then you could try the other direction, lever valves are only quarter turn from on to off.