dunphy TD - Fault Finding

Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 161 of 165 TD/TAD4 Manual Rev 4
12.8.4 Fault Finding
Symptom or Fault
Probable Cause
Pump motor runs, but no oil delivered.
 Pump coupling loose on either pump side or motor side.
 Fuel starvation.
 Oil system air locked.
 Pump seized.
 Pump shaft broken.
Pump rotates but no oil passing from nozzle.
 Burner solenoid valves not opening.
 Blocked atomising nozzle.
 Fuel starvation.
Pump noisy.
 Gas or air in pump
 Pump worn.
 Blocked line filters.
 Insufficient pressure in pumped ring main to suppress
gas formation in the suction side of the pump.
Fluctuating Oil Pressures.
 Dirt in regulating valve.
 High vacuum at pump suction.
 Fuel starvation.
 Worn pump.
 Pump drive slipping.
 Air leakage into the system.
Low Oil Pressures.
 Pump undersized.
 Pump worn.
 Defective solenoid valve.
 Oil starvation/defective metering system.
 Regulating valve stuck.
Pump Overheats.
 Pump oversized.
 Miss-alignment of pump drive.
 Dirt in oil.