When the hot water side of your faucet has no volume, it could be due to a variety of reasons. The most common causes are clogged aerators or shut off valves that have been closed too far.
If you have an older style faucet, it may also be due to calcium deposits building up in the pipes and blocking water flow.
In some cases, replacing the old faucet with a newer model can help improve the water pressure on the hot water side.
To troubleshoot this issue yourself, start by checking any aerators or filters near the tap and cleaning them if necessary.
If this doesn't solve the problem, try opening any shutoff valves under your sink more fully before attempting to replace them entirely.
If all else fails, it may be time to consult a professional plumber. With the right knowledge and tools, they can help you pinpoint the issue and get your hot water running again.