FAULT CONDITION
Heater ignites but control assembly shuts
heater off before running out of fuel.
DISPLAY
C4
Display shows
Extinguished
C5
Display shows
Flame
C6
Display shows
Change
160108-01
TROUBLESHOOTING
POSSIBLE CAUSE
Flame
1. Not enough fuel in tank to
maintain combustion
2. Water in fuel tank
3. Pump pressure incorrect
4. Dirty fuel filter
5. Obstruction in nozzle
6. Photocell assembly not
properly installed
7. Dirty photocell lens
8. Defective photocell
Improper
1. Pump pressure too high
2. Heater inlet or outlet is cov-
ered and unit is not getting
enough air for combustion
3. Fan set screw is loose
Flame
1. Heater inlet suddenly
blocked by debris.
2. Water in fuel tank
3. Dirty fuel filter
4. Obstruction in nozzle
5. Fan set screw is loose
www.usaprocom.com
Continued
WARNING: High voltage!
Unplug heater before servicing.
REMEDY
1. Fill tank. See Fuels, page 6.
Restart heater.
2. Drain and flush fuel tank
with kerosene. See Storing,
Transporting or Shipping,
page 8.
3. See Pump Pressure Adjust-
ment, page 14.
4. See Fuel Filter, page 14.
5. See Nozzle Assembly,
page 16.
6. Make sure photocell boot is
fully seated in bracket.
7. Clean photocell lens.
8. Replace photocell.
1. See Pump Pressure Adjust-
ment, page 14.
2. Unplug heater. Remove ob-
structions or loose material
from heater inlet or outlet.
3. Tighten fan set screw to
40-50 in-lbs. See service
procedures on page 13.
1. Unplug heater. Remove ob-
structions or loose material
from heater inlet.
2. Drain and flush fuel tank
with kerosene. See Storing,
Transporting or Shipping,
page 8.
3. See Fuel Filter, page 14.
4. See Nozzle Assembly,
page 16.
5. Tighten fan set screw to
40-50 in-lbs. See service
procedures on page 13.
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