If you have a mesh filter on your spout, open it up to clear any debris it may have which partially blocks and stops hot water from a tank feed as it is not under a lot of pressure but cold water may still come through fine.
Is it a 1/4 turn or a screw down type? If the latter, when you open the hot tap, pull up on the handle, does it increase the flow? If so the tap needs serviced or replaced.
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