The Diplomat 8702 is a commercial-grade dishwasher designed for heavy-duty use in restaurants and food service establishments. This service manual provides comprehensive technical information for qualified service technicians, including safety procedures, technical specifications, component diagrams, troubleshooting guides, and maintenance procedures. Below are key sections covering all aspects of service and repair.
Before performing any service procedures, read and understand all safety warnings and precautions.
| Hazard | Precaution |
|---|---|
| Electrical Shock | Disconnect power before servicing. Verify power is off with voltage tester. |
| High Temperature | Allow unit to cool completely before disassembly. Wear heat-resistant gloves. |
| Chemical Exposure | Wear protective gloves and eyewear when handling detergents or cleaning agents. |
| Moving Parts | Ensure all moving parts are stopped and secured before servicing. |
| Water Pressure | Release water pressure before opening water system components. |
Major components and their locations within the dishwasher assembly.
| Component | Location | Function |
|---|---|---|
| Main Control Board | Behind front panel | Processes all operational commands |
| Wash Motor | Bottom compartment | Drives wash arms and circulation system |
| Heating Element | Tank bottom | Heats wash and rinse water |
| Water Inlet Valve | Rear panel | Controls water flow into machine |
| Drain Pump | Lower right side | Removes waste water from tank |
| Temperature Sensors | Multiple locations | Monitor water and air temperatures |
Electrical components and wiring specifications.
WARNING! Always verify power is disconnected before testing electrical components.
Water flow path and component relationships.
Tip: Check water inlet screen monthly for debris accumulation.
Electronic control board operation and programming.
Control Panel: POWER, CYCLE SELECT, TEMPERATURE SET, DETERGENT LEVEL, START/STOP.
Programming: Access service mode by holding TEMPERATURE SET + START for 5 seconds. Diagnostic codes displayed on control panel. Cycle parameters adjustable in programming mode. Default settings restore by holding CYCLE SELECT during power-up.
Step-by-step component removal and replacement.
WARNING! Document wire connections before disassembly. Take photos for reference.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Power supply, main fuse | Check circuit breaker, test main fuses, verify power at terminal block. |
| No water fill | Inlet valve, water pressure | Test inlet valve coil, check water pressure, clean inlet screen. |
| Poor cleaning | Spray arms, water temperature | Clean spray arm nozzles, verify water temperature ≥140°F. |
| Will not drain | Drain pump, drain hose | Test drain pump motor, check for hose obstructions. |
| Error codes | Sensor failure, control board | Reference error code chart, test sensors, check control board. |
Preventive maintenance tasks and intervals.
Common replacement parts with part numbers.
| Part Number | Description | Qty |
|---|---|---|
| 8702-001 | Wash Motor Assembly | 1 |
| 8702-002 | Heating Element | 1 |
| 8702-003 | Control Board | 1 |
| 8702-004 | Drain Pump | 1 |
| 8702-005 | Water Inlet Valve | 1 |
| 8702-006 | Temperature Sensor | 2 |
Complete electrical schematics available in separate appendix. Main power distribution shown below.
Power Input → Main Disconnect → Control Transformer → Main Control Board → Component Relays → Motors/Heaters/Sensors
Service Support: 1-800-555-1234; www.diplomatservice.com