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Bad shower valve.
If it had been working fine -- then if it is a cartriage type -- replace it --
Possibly a pressure reducing valve installed after piping for first faucet, which would cause situation describing.
Mine is fine! Yours is where the problem is. There is too little information here to answer the question. Troubleshooting would be to start at the faucet and work backwards until the cause is found. Are we talking water that starts and stops or hot water that runs out and becomes cold?
Take the hose off the water faucet and check the little filter in the hose end. It may be plugged with fine sand or rust.
Unscrew the aerator from the end of the faucet where the water comes out and clean the screen. Sediment build up slows the flow.
Now this is a real testor. I think it has to be a farce question. Anybody else living in the premises? Cold and/or hot water doesn't come out?
If you have galvanized pipe in your house, you probably have debris in; your water line, your angle stop (AKA cut off),your supply line to the hot side of the fixture. If I could see it, I could tell you how to fix it. I would suggest calling a plumber. We aren't all a bunch of crooks.
The problem could be as simple as a clogged screen in your faucet. It also may be a low flow gasket which is in the faucet to reduce water usage. Has this alwys been a problem or is it a new problem?
Type your answer here... The water is too cold.
If shut off the hot water valve then you take off your supply line from your hot water valve to your faucet and then turn your hot water valve on slowly (with of course a bucket or something to collect the water under it) and if you can see you have water pressure and flow then most likely the problem would be in your faucet on the hot side. If you have no pressure or flow when you turn the hot valve on then it could be debris plugging your hot water pipe or your hot water service valve (angle stop, straight stop) which older galvanized pipes are known to do so. To fix the problem you would need to find out where the problem is then either fix or replace the faucet or replace the angle/straight stop or try back flushing the hot water pipe and or replace the pipe with pex or copper pipe.
you did not pay bill