jamco70
Member
I took the spout cap off the shower arm and no matter which way I turned the cartridge stem, the water wouldn't shut off.Make sure the tub/shower that’s capped off remains in the off position. Remove the spout cap to make sure.
Then go to the water heater and turn the cold water valve off at the top.
Now go to a lavatory faucet and turn on the hot water side. It should flow water and then eventually trickle to nothing.
Try that and report back.