Operating instructions

5. Maintenance of the Heater

5.1 Annual Maintenance........................................................................................................ 501

6. Basic Troubleshooting

6.1 General Information......................................................................................................... 601

6.2 Operational Failure Symptoms (Reading the flash code) ............................................... 601

6.2.1 Reading a Fault Code with 1531 “Comfort” Timer Installed ................................ 602

6.2.2 Storing a Fault Code in Memory ........................................................................... 602

6.3 Operational Failure Symptoms via Fault/Flash Code...................................................... 603

6.4 Reading and Removing Fault Codes Stored in Memory with PC Diagnostics Kit .......... 604

7. Warranty Policy

8.1 Warranty Policy................................................................................................................ 801

List of Figures

101 Webasto Thermo 230/300 Heater ................................................................................... 101

201 7-Day Digital Timer – Model 1531................................................................................... 203

301 Thermo 230/300 Heater Dimensions .............................................................................. 302

302 Coolant Circulating Pump Assembly - U 4814 ................................................................ 303

303 Coolant Circulating Pump Assembly - U 4851 ................................................................ 304

304 Pump Operating Data - U 4851 ....................................................................................... 304

401 Series Plumbing Circuit (Shown with heater installed).................................................... 404

402 Parallel Plumbing Circuit (Shown with heater installed).................................................. 404

403 Engine Preheat/Boost Heating Circuit............................................................................. 405

404 Example of Heater Installation......................................................................................... 406

405 Fuel Standpipe Installation .............................................................................................. 407

406 Fuel Line Parameters ...................................................................................................... 408

407 On/Off Switch................................................................................................................... 409

408 7-Day Digital Timer Model 1531 ...................................................................................... 409

409 Wiring Diagram with Switch............................................................................................. 410

410 Wiring Diagram with Timer .............................................................................................. 411

Contents

Thermo 230/300