10
TROUBLESHOOTING
Sympton
Red lamp ON.
Motor does not rotate.
Motor turns, but no
fuel pumped up.
Fuel pumped up, but
no fuel fed to heater.
All lamps go off.
Yellow lamp ON.
Cause
- Too much fuel put in fuel
sump.
- Lifter tilted by mistake.
- Upper limit float switch
defective.
- Control box malfunction.
- Too much fuel in fuel
sump.
- No power supplied.
- Pump and/or motor lock.
- Control box malfunction.
- Insufficient fuel in fuel
sump for priming.
- Pump height too high.
- Main fuel tank empty.
- Main tank valve closed.
- Air leak from inlet pipe.
- Driving shaft is off or
broken.
- Pump valve lock.
- Outlet valve closed.
- Outlet pipe air lock.
- Outlet pipe clogged.
- No power supplied.
- Control box malfunction.
- Fuel consumption
larger than lifter can
pump up.
- Inlet pipe clogged.
- Air leak from inlet pipe.
- Fuel strainer clogged.
- Fuel leak from outlet
pipe.
- Driving shaft is off or
broken.
- Pump and/or motor lock.
- Pump valve lock.
Solution
- Let oil level go down, then
turn it ON.
- Correct tilt. Turn operation
switch to OFF, then turn it
ON.
- Replace float switch.
- Check fuse then replace
the circuit board.
- Let oil level go down, then
turn it ON.
- Check power supply and
operation switch.
- Replace pump and/or motor.
- Replace the circuit board.
- Add priming fuel as
instructed.
- Reduce pump height to
26 ft. (8 m) or less.
- Fill the main fuel tank.
- Open the valve.
- Repair leaks and check all
joints and connections.
- Fix or replace the shaft.
- Replace the pump.
- Open outlet valve.
- Purge air from pipes.
- Clean the clogged pipe.
- Check power supply and
turn the operation switch
to ON.
- Check fuse on board and/or
replace circuit board.
- Consumption is too much
for lifter pump add another
lifter pump.
- Clean the clogged pipe.
- Repair leaks.
Check and tighten fittings.
- Clean the strainer.
- Repair the leaks.
- Fix and replace the shaft.
- Replace the motor and pump.
- Replace the pump.
