Remove the cover plate of the knob that controls the shower and turn of the stop valves. That’ll allow you to turn the water main back on.
Like others have said, it’s probably a bad cartridge and can be an easy diy job. Check out Nextdoor listings - most handymen won’t ask for landlord things and can actually repair this
cha_man_ t1_iubr2cm wrote
Reply to Plumbing advice? by Sufficient-Lab-5769
Remove the cover plate of the knob that controls the shower and turn of the stop valves. That’ll allow you to turn the water main back on.
Like others have said, it’s probably a bad cartridge and can be an easy diy job. Check out Nextdoor listings - most handymen won’t ask for landlord things and can actually repair this