SECTION 4: TROUBLESHOOTING
COMMON PROBLEMS
Inspection, testing and repair of electrical equipment should only be performed by a qualified service tech- nician. Many of the tests require that the unit have power to it and live electrical components be exposed.
USE EXTREME CAUTION WHEN TESTING THE MACHINE.
Problem: Dish machine will not run, no voltage at wash relay terminals L1 and T1.
1.Electrical power not installed to machine, service (main) power disconnect off. Ensure electrical wiring is run to machine and service (main) disconnect is on.
2.Branch circuit breaker tripped or fuse is blown. Reset or replace as required. Have an electrician check machine amp draw if problem keeps occuring.
3.Loose or broken connection to dish machine. Tighten, replace or repair as required.
Problem: Machine cycles continuously.
1.Limit switch actuator is loose or has fallen off. Reassemble/bend metal lever if necessary.
2.Faulty limit switch. Replace switch.
Problem: Machine will not fill, other functions work.
1.No water supply to machine. Ensure that water is hooked up properly to machine and that it is turned on.
2.Faulty Hot Water solenoid valve diaphragm or coil. Replace diaphragm and clean out valve. Measure continuity on coil, if there is none, replace the coil.
3.Faulty float switch. Ohm out the switch to ensure that upper and lower floats are working. If not, check float wiring to see if it is correct; if so, replace float.
Problem: Machine fills continuously even with no power to the dish machine.
1.Solenoid valve jammed/stuck in the open position. Check diaphragm and coil, replace as required.
2.Faulty float switch. Ohm out the switch to ensure that upper and lower floats are working. If not, check float wiring to see if it is correct; if so, replace float switch.
Problem: Wash motor does not run, other functions work.
1.Loose wire connection to limit switch or relay. Tighten wires.
2.Faulty pump motor. Replace pump motor.
3.Mechanical binding in the pump. If motor has correct incoming voltage, and the overload is tripping, repair or replace the pump.
Problem: Wash motor does not run; other functions work.
1.High or low voltage problem. Check voltage at motor and at power terminal block. Ensure it meets the electrical voltage specifiactions for the dish machine.
2.Faulty limit switch. Replace limit switch.
Problem: Wash motor runs continuously.
1. Wash relay welded closed. Turn machine off. If wash relay does not release, replace.
Problem: Low water pressure.
1.Water level is too low. Ensure that incoming water line pressure meets the requirements on dish machine data plate.
2.Wash arms clogged. Remove wash arms and clean.
3.Obstruction in pump housing. Disassemble and clear.
4.
Delta 1200 Technical Manual
Issued:
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