NEVER LEAVE HEATER UNATTENDED WHILE BURNING OR
WHILE CONNECTED TO A POWER SOURCE
© 2020, Lavorwash
Kerosene Forced Air Heater User’s Manual
12
Troubleshooting Guide
Problem
Possible Cause
Solution
Heater Ignites, but main PCB shuts
off after a short period of time.
Lamp flickers and LED display
shows “E1”.
1. Incorrect pump pressure.
2. Dirty input, output or lint filter.
3. Dirty fuel filter.
4. Nozzle is dirty.
5. Photocell lens is dirty.
6. Photocell not installed properly.
7. Photocell is defective.
8. Improper electrical connection
between main PCB and photocell.
1. Adjust pump pressure.
2. Clean / replace air or lint filter.
3. Clean / replace fuel filter.
4. Clean / replace Nozzle.
5. Clean / replace photocell.
6. Adjust photocell position
7. Replace photocell
8. Check wiring connections
(see wiring diagrams on page 11).
Heater will not operate or motor
runs for a short time.
Lamp flickers and LED display
shows “E1”.
1. No paraffin in the fuel tank.
2. Incorrect pump pressure.
3. Corroded spark plug or incorrect
plug gap.
4. Dirty fuel filter.
5. Dirty nozzle.
6. Moisture in fuel tank.
7. Improper electrical connection
between transformer and circuit
board.
8. Ignitor wire not connected to spark
plug.
9. Defective ignitor.
1. Fill tank with fresh paraffin.
2. Adjust pump pressure.
3. Clean / replace spark plug.
4. Clean / replace fuel filter.
5. Clean / replace nozzle.
6. Rinse fuel tank with clean, fresh
paraffin.
7. Inspect all electrical connections.
(See wiring diagrams on page 11.)
8. Re-attach ignitor wire to spark plug.
9. Replace ignitor.
Fan does not operate when heater
is plugged in and power switch is
in the “ON” position. The lamp is
flickering or and LED display shows
“E1” or “E2”.
1. Thermostat is set too low (does not
apply to FF45 model).
2. Broken electrical connection
between main PCB and motor.
1. Rotate thermostat to a higher
setting
2. Inspect all electrical connections
(see wiring diagrams on page 11).
Lamp is flickering and LED display
shows “E3”.
1. Thermostat switch has failed.
1. Replace thermostat switch (see
Wiring diagrams on page 11).
Poor combustion and / or excess
soot production.
1. Dirty input, output or lint filter.
2. Dirty fuel filter.
3. Poor quality of fuel.
4. PSI is too high or too low.
1. Clean / replace air or lint filter.
2. Clean / replace fuel filter.
3. Flush fuel tank and refuel heater.
4. Use proper pressure.
Heater does not turn on and the
lamp is not lit.
1. Temperature limit sensor has
overheated.
2. No electrical power.
3. Fuse is blown.
4. Improper electrical connection
between temperature limit sensor
and circuit board.
1. Push power switch to “OFF and
allow heater to cool for 10 minutes.
Restart heater.
2. Check power cords for proper
connection and test the power
supply.
3. Check / replace the fuse.
4. Inspect all electrical connections
(see wiring diagrams on page 11).
