F.A.Q
  • Pump is not running
    Check if Possible explanation Solution
    ....the motor is turning.
    YES Explication possible Motor coupling is defective or has came loose Solution Check coupling and repair or replace as appropriate.
    NO Explication possible Pump has seized Solution Remove 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 possible Motor does not work Solution Test motor and connections and repair or replace if necessary, having first examined the pump.
  • Pump is running but does not deliver oil
    Check if Possible explanation Solution
    …oil flows out of the high-pressure port when it is loosened.
    YES Explication possible Nozzle or in-line solenoid valve is blocked Solution Inspect nozzle and valve for blockage (dirt, grit, fuel,...)
    Explication possible Solenoid valve or pressure regulator is defective Solution Switch 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.
    NO Explication possible Oil level in tank is low Solution Check tank and refill.
    Explication possible Inlet pipe valve is closed Solution Open the valve.
    Explication possible On a new installation, the check valve is the wrong way round Solution Check that all valves are facing the right way.
    …and vacuum gauge shows a high vacuum.
    YES Explication possible Blockage up-stream Solution Check in-line filter and non-return valve.
    Explication possible Pipe is undersized Solution Check pipe dimensions.
    …no oil flows from the high-pressure port when it is loosened.
    …and vacuum gauge shows a low vacuum.
    YES Explication possible Pump filter is plugged Solution Remove pump cover and check filter condition.
    Explication possible Air leak Solution Check the tightness of pump cover (especially if the filter has recently been changed/cleaned) and check the cover gasket.
    Explication possible Pipe is oversized Solution Very important for one-pipe systems. Check pipe diameter.
    Explication possible Pump rotates in a wrong way Solution If 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 possible By-pass plug is missing in two-pipe installation Solution Check if the by-pass plug is installed.
    Explication possible Suction and return lines have been swapped Solution Check they have been correctly fitted.
    Explication possible Pump is worn out Solution Check this by carrying out a pressure test.
  • Nozzle pressure is too high / too low
    Check if Possible explanation Solution
    …the pressure can be adjusted.
    …and pressure gauge shows a low pressure.
    YES Explication possible Pump is not properly sized for the nozzle performance (remembering fuel viscosity) or any hydraulic attachments i.e. hydraulically opened air flap Solution Change pump or nozzle as appropriate.
    Explication possible Pump is worn out Solution Check this by carrying out a pressure test. Replace pump.
    …and pressure gauge shows a high pressure.
    YES Explication possible Dirt in regulating valve Solution Dismantle pressure regulator or replace pump.
    …the pressure can be adjusted.
    …and the pump pressure oscillates.
    YES Explication possible Air in the oil Solution Check vacuum does not exceed 0,45 bars. Check suction line for leaks.
    Explication possible Pressure regulating valve is defective or clogged Solution Dismantle pressure regulator or replace pump.
    Explication possible Motor coupling is slipping Solution Check coupling and check for speed variations.
    …the pressure can not be adjusted.
    …and the pressure is constantly too high or too low.
    YES Explication possible Pressure regulating valve is defective or clogged Solution Dismantle pressure regulator or replace pump.
    NO Explication possible Pressure gauge is defective or incorrectly installed Solution Check pressure gauge. Bleed when fitting.
  • The oil pump makes noise
    Check if Possible explanation Solution
    …an increasingly loud whine is coming from the pump.
    YES Explication possible Vacuum is too high (check with a vacuum gauge) Solution Check for closed valves, blocked filters, check valves that are stuck.
    …the pump generates a cracking noise and the pressure gauge oscillates.
    YES Explication possible Air bubbles in the suction line Solution Check suction line for leaks. Bleed pump if installation is one-pipe.
  • Excessive pump temperature
    Check if Possible explanation Solution
    ...a small nozzle flow is used with a one-pipe installation.
    YES Explication possible Heat build-up from recirculation in pump plus heat radiated from motor etc. Solution Convert 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.