DoorHan DCUH-1 Owner's Manual - Page 6

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7. TROUBLESHOOTING

Table 7.1. Possible faults, their causes and solutions

Problem

Leveler does not

rise (pump does not work)

Leveler does not

rise (pump works)

Leveler does not lower

Possible cause

No supply voltage

Faulty power switch

Blown fuse

Faulty contactor

No power to the contactor coil

No jumper on terminals

for safety devices

Interlock switch open

Leveler does not respond to pressing the

control button

Incorrect phasing

No power to the electromagnetic valve coil

Faulty electromagnetic valve coil or valve

Solution

Check the electrical wires

and the voltage in the socket

Replace main power switch

Replace fuse (FU1, FU2)

Replace main board

Set the jumper

Check the interlock

Replace control board

Swap any two phases in the control unit

Check wiring from control unit to coil.

Check coil voltage (24 VDC)

Replace main board

Replace coil or valve