F.A.Q
  • Pump is not running
    Check ifPossible explanationSolution
    ....the motor is turning.
    YESExplication possibleMotor coupling is defective or has came looseSolutionCheck coupling and repair or replace as appropriate.
    NOExplication possiblePump has seizedSolutionRemove pump cover and check pump. If rust and / or an abnormal amount of dirt are found, check tank for water and check condition of filters. Replace pump.
    Explication possibleMotor does not workSolutionTest motor and connections and repair or replace if necessary, having first examined the pump.
  • Pump is running but does not deliver oil
    Check ifPossible explanationSolution
    …oil flows out of the high-pressure port when it is loosened.
    YESExplication possibleNozzle or in-line solenoid valve is blockedSolutionInspect nozzle and valve for blockage (dirt, grit, fuel,...)
    Explication possibleSolenoid valve or pressure regulator is defectiveSolutionSwitch on the coil and check for magnetic pull. If there is no pull, check the current. If the current is OK, change the coil. When the coil is in order, check the pressure regulating valve or replace the pump.
    …no oil flows from the high-pressure port when it is loosened.
    NOExplication possibleOil level in tank is lowSolutionCheck tank and refill.
    Explication possibleInlet pipe valve is closedSolutionOpen the valve.
    Explication possibleOn a new installation, the check valve is the wrong way roundSolutionCheck that all valves are facing the right way.
    …and vacuum gauge shows a high vacuum.
    YESExplication possibleBlockage up-streamSolutionCheck in-line filter and non-return valve.
    Explication possiblePipe is undersizedSolutionCheck pipe dimensions.
    …no oil flows from the high-pressure port when it is loosened.
    …and vacuum gauge shows a low vacuum.
    YESExplication possiblePump filter is pluggedSolutionRemove pump cover and check filter condition.
    Explication possibleAir leakSolutionCheck the tightness of pump cover (especially if the filter has recently been changed/cleaned) and check the cover gasket.
    Explication possiblePipe is oversizedSolutionVery important for one-pipe systems. Check pipe diameter.
    Explication possiblePump rotates in a wrong waySolutionIf the installation is new, be sure that motor and pump rotation are the same. A pump turning in the wrong direction can not draw oil.
    Explication possibleBy-pass plug is missing in two-pipe installationSolutionCheck if the by-pass plug is installed.
    Explication possibleSuction and return lines have been swappedSolutionCheck they have been correctly fitted.
    Explication possiblePump is worn outSolutionCheck this by carrying out a pressure test.
  • Nozzle pressure is too high / too low
    Check ifPossible explanationSolution
    …the pressure can be adjusted.
    …and pressure gauge shows a low pressure.
    YESExplication possiblePump is not properly sized for the nozzle performance (remembering fuel viscosity) or any hydraulic attachments i.e. hydraulically opened air flapSolutionChange pump or nozzle as appropriate.
    Explication possiblePump is worn outSolutionCheck this by carrying out a pressure test. Replace pump.
    …and pressure gauge shows a high pressure.
    YESExplication possibleDirt in regulating valveSolutionDismantle pressure regulator or replace pump.
    …the pressure can be adjusted.
    …and the pump pressure oscillates.
    YESExplication possibleAir in the oilSolutionCheck vacuum does not exceed 0,45 bars. Check suction line for leaks.
    Explication possiblePressure regulating valve is defective or cloggedSolutionDismantle pressure regulator or replace pump.
    Explication possibleMotor coupling is slippingSolutionCheck coupling and check for speed variations.
    …the pressure can not be adjusted.
    …and the pressure is constantly too high or too low.
    YESExplication possiblePressure regulating valve is defective or cloggedSolutionDismantle pressure regulator or replace pump.
    NOExplication possiblePressure gauge is defective or incorrectly installedSolutionCheck pressure gauge. Bleed when fitting.
  • The oil pump makes noise
    Check ifPossible explanationSolution
    …an increasingly loud whine is coming from the pump.
    YESExplication possibleVacuum is too high (check with a vacuum gauge)SolutionCheck for closed valves, blocked filters, check valves that are stuck.
    …the pump generates a cracking noise and the pressure gauge oscillates.
    YESExplication possibleAir bubbles in the suction lineSolutionCheck suction line for leaks. Bleed pump if installation is one-pipe.
  • Excessive pump temperature
    Check ifPossible explanationSolution
    ...a small nozzle flow is used with a one-pipe installation.
    YESExplication possibleHeat build-up from recirculation in pump plus heat radiated from motor etc.SolutionConvert to two-pipe or fit filter upstream from pump with return from pump to filter. This circulation outside of the burner will help to cool the system.