Many novice technicians see a code 4372 and assume the lift controller is faulty. This is almost never the case. The controller is protecting itself from a real power issue.
The neutral zone in the tiller's steering map or hydraulic controls is too narrow.
Thermal / load tests
On the Jungheinrich CAN-Bus system (Controller Area Network), error 4372 typically translates to:
Error code on a Jungheinrich EJE 120 typically points to a tillerhead failure . This is a common issue often caused by a neutral zone that is too narrow, making the truck think it is being activated when it should be stationary. Key Causes and Troubleshooting