Support
Pump is not running
| Check if | Possible explanation | Solution | ||
|---|---|---|---|---|
| ....the motor is turning. | ||||
| Yes | Possible explanation | Motor coupling is defective or has came loose. | Solution | Check coupling and repair or replace as appropriate. |
| NO | Possible explanation | 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. |
| Possible explanation | 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 | Possible explanation | Nozzle or in-line solenoid valve is blocked | Solution | Inspect nozzle and valve for blockage (dirt, grit, fuel,...) |
| Possible explanation | Le Solenoid valve or pressure regulator is defective. | Solution | Connect the coil and check for magnetic attraction. If no attraction, check current. If current is OK, change coil. If coil is OK, check pressure regulator or replace pump. | |
| …no oil flows from the high-pressure port when it is loosened. | ||||
| NO | Possible explanation | Oil level in tank is low. | Solution | Check tank and refill. |
| Possible explanation | Inlet pipe valve is closed. | Solution | Open the valve. | |
| Possible explanation | 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 low vacuum. | ||||
| YES | Possible explanation | Blockage up-stream | Solution | Check in-line filter and non-return valve. |
| Possible explanation | 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 | Possible explanation | Pump filter is plugged. | Solution | Remove pump cover and check filter condition. |
| Possible explanation | Air leak | Solution | Check the tightness of pump cover (especially if the filter has recently been changed/cleaned) and check the cover gasket. | |
| Possible explanation | Pipe is oversized | Solution | Very important for one-pipe systems. Check pipe diameter. | |
| Possible explanation | 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. | |
| Possible explanation | By-pass plug is missing in two-pipe installation | Solution | Check if the by-pass plug is installed. | |
| Possible explanation | Suction and return lines have been swapped | Solution | Check they have been correctly fitted. | |
| Possible explanation | Pump is worn out | Solution | Check this by carrying out a pressure test. | |
the pressure is constantly too high or too low.
| Check if | Possible explanation | Solution | ||
|---|---|---|---|---|
| …the pressure can be adjusted. | ||||
| YES | Possible explanation | 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. |
| Possible explanation | Pump is worn out | Solution | Check this by carrying out a pressure test. | |
| …and the pressure is constantly too high or too low. | ||||
| YES | Possible explanation | Pressure regulating valve is defective or clogged | Solution | Dismantle pressure regulator or replace pump. |
| … the pressure can be adjusted and the pump pressure oscillates. | ||||
| YES | Possible explanation | Air in the oil | Solution | Check vacuum does not exceed 0,45 bars. Check suction line for leaks. |
| Possible explanation | Pressure regulating valve is defective or clogged | Solution | Dismantle pressure regulator or replace pump. | |
| Possible explanation | 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 | Possible explanation | Pressure regulating valve is defective or clogged | Solution | Dismantle pressure regulator or replace pump. |
| NO | Possible explanation | Pressure gauge is defective or incorrectly installed | Solution | Check pressure gauge. Bleed when fitting. |
The oil pump makes noises
| Check if | Possible explanation | Solution | ||
|---|---|---|---|---|
| …an increasingly loud whine is coming from the pump. | ||||
| YES | Possible explanation | 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 | Possible explanation | 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 | Possible explanation | 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. |