These are the possible reasons and solutions

ERROR CODE	WHAT DOES IT MEAN?
01	The stop-up switch is not being activated, ie motor is not raising claw. Could be a UD fuse, tangled string, faulty relay, faulty UD motor.
20	The tilt sensor is touching the metal surrounds. Check the tilt sensor is not trapped against the surround. Adjust or remove it.
03	The claw can't lower. Check UD fuse or look for tangled string.
04	Up-down motor blocked for over 3 seconds. Check for tangled string or trapped claw; possibly a physical impediment to the claw pulling up.
05	Left-right motor blocked for over 3 seconds. Turn off and on and observe if something is stopping the machine reaching the stop-left switch.
06	Forwards-backwards motor blocked for over 3 seconds. Turn off and on and observe if something is stopping the machine reaching the stop-front switch.
10	Prize sensor is blocked or disconnected. Check the prize chute for blockages, the connections to the sensor and at plug J10 on the PCB.
91	Coin 1 meter not connected or broken. Check the wires on back of the coin meter or plug Jp6. Change meter.
92	Coin 2 meter not connected or broken. Check the wires on back of the coin meter or plug Jp6. Change meter.
93	Prize meter not connected or broken. Check the wires on back of the coin meter or plug JP11. Change meter.