You should hear a ticking sound.
How to fix a wall clock that runs slow.
Use the fingers of your dominant hand to gently turn the regulation screw.
Swing the pendulum on the inside of the clock if it has a pendulum.
Again you should also check the electric clocks handles.
The clock will run slower.
If not there may be internal damage.
To slow down the clock loosen the adjustment nut turn it toward your left.
Do you see any damage to the wires.
To speed up the clock tighten the nut turn it toward your right.
The first and easiest problem to fix is restoring the clock s battery power which is done by removing the battery from the back of the clock and replacing it with a fresh one.
Turning the screw to the left will lower the pendulum slightly and slow down the clock.
Each turn of the screw slows the clock by two minutes per 24 hour period.
This screw regulates the speed of the clock.
The bob will settle lower making the effective length of the pendulum longer.
How to troubleshoot wall clocks.
Gently take off the compartment and take a look at the connections.
If your clock is running slow then there might be an issue with the wiring.
Wind the clock if it has stopped running.
If so replace the cables with new ones and see if it works or not.
Open the door and bring the pendulum all the way to the side then let.