The Delta Monitor 1400 shower faucet uses an anti-scald device that keeps you from accidentally turning the water on too hot. Periodically you may need to make adjustments to the anti-scald feature, or even replace the faucet cartridge which requires removing the faucet handle. Removing the handle on a Delta Monitor 1400 shower faucet is a matter of locating the set screw that secures the handle. The set screw is behind a decorative cover plug that blends with the handle,virtually hiding the screw.
Turn off the water supply to the shower faucet. There is a shut-off valve usually behind the wall that the shower faucet attaches to with an access to the shut-off valves in the adjoining room. If you cannot find the shut-off valves, turn off the main water supply to the entire house.
Close the drain and place a rag over the drain. This prevents losing the handle set screw down the drain if you accidentally drop it during the removal process.
Look for a small circular cover plug on the side of the handle. Pry the plug away from the handle with a utility knife to access the set screw, which secures the handle to the faucet cartridge.
Insert a Allen wrench into the set screw and turn the screw counterclockwise to remove it from the handle. Pull the handle straight off the cartridge.