www.desatech.com 111168-01A8TROUBLESHOOTINGWARNING: Never service heater while it is plugged in, operating,or hot. Severe burns and electrical shock can occur.REMEDY1. Check circuit breaker in elec-trical panel2. Turn thermostat knob to ahigher setting3. Check all electrical connec-tions. See Wiring Diagrams,page 154. If fan does not turn freely, seePump Rotor, page 145. Replace ignition control as-sembly6. Replace motor1. Fill tank with kerosene2. See Pump Pressure Adjust-ment, page 103. See Fuel Filter, page 114. See Nozzle Assembly, page 125. Drain and flush fuel tank withclean kerosene. See Storing,Transporting, or Shipping,page 76. Check electrical connections.See Wiring Diagrams , page 157. Replace ignitor, see page 118. Replace ignition control as-sembly1. See Pump Pressure Adjust-ment, page 102. See Air Output, Air Intake, andLint Filters, page 103. See Fuel Filter, page 114. See Nozzle Assembly, page 125. Make sure photocell boot isproperly seated in bracket6. Clean photocell lens7. Check electrical connections.See Wiring Diagrams, page 158. Replace photocell9. Replace ignition control as-semblyPOSSIBLE CAUSE1. No power to heater2. Thermostat setting is too low3. Bad electrical connection be-tween motor and ignition con-trol assembly or ignition controlassembly and power cord4. Binding pump rotor5. Defective ignition control as-sembly6. Defective motor1. No fuel in tank2. Pump pressure incorrect3. Dirty fuel filter4. Obstruction in nozzle5. Water in fuel tank6. Bad electrical connectionbetween ignitor and ignitioncontrol assembly7. Defective ignitor8. Defective ignition control as-sembly1. Pump pressure incorrect2. Dirty air intake, air output,and/or lint filter3. Dirty fuel filter4. Obstruction in nozzle5. Photocell assembly not properlyinstalled (not seeing the flame)6. Dirty photocell lens7. Bad electrical connection be-tween photocell and ignitioncontrol assembly8. Defective photocell9. Defective ignition control as-semblyFAULT CONDITIONMotor does not start five secondsafter heater is plugged inMotor starts and runs but heaterdoes not igniteHeater ignites but ignition controlassembly shuts heater off after ashort period of timeWARNING: High voltage!WARNING: High voltage!WARNING: High voltage!