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Symptom
1. Heater shuts off
2. Loss of prime overnight
Won't hold vacuum
IS TANK EMPTY?
3. Fails to start.
4. Reduced air pressure,
cannot increase.
5. Hard starting diminished
flame.
6. Heater cycles frequently,
without thermostat
16
TROUBLE SHOOTING
♦Most Likely
Cause
♦Manual reset
♦Vacuum air leak in fuel line
♣Plugged pump screen
• Plugged filter or tank oil empty
♦Vacuum Leak
♦Inadequate Fuel Supply
• No Pressure
•No Pre-heat
•Auto start circuit not functioning
•No Arc
•No Air Pressure
♦Gauge may be bad.
♦Intake filter muffler is plugged
with dust or dirt.
♣Compressor vanes may be worn.
• Exposed to water.
♦Partially plugged filter.
♣Out of fuel
♣No oil to burner
•Restriction in nozzle usually only
when initially installed. New lines
may have foreign material in them.
•Air band open too far
♦Heater over firing.
•Less Likely
♣Least Likely
Remedy
♦Requiring manual restart by reset button on.
♦Check all fuel connections. Tighten fittings.
♣ Check pump screen, may need cleaning-to access, remove pump
cover
• Clean filter. Using vent port, reprime pump (See Figure 6 & 7).
♦Open bleeder port if air present. Check and tighten fittings.
♦Clean filter. Check all fuel connections. Tighten fittings.
• Check, may need cleaning—to access, remove pump cover.
• Using vent port, reprime pump (See Figure 6 & 7)
• Be sure all wiring to pre-heater is tight-no loose connections.
• Bad firerod-Replace. Continuity at terminals.
• Check circuit control board and replace if necessary.(Call Factory)
• Check continuity at terminals of firerod limit snap switch.
Replace if needed.
• Check springs to electrode rod adjustment (under transformer)
make sure they make good contact. Open burner door and make
sure electrode tips aren't touching flame cone. Readjust.
• Check pressure regulator and adjust. Check air supply line for
restrictions or leaks. Pull compressor cover and inspect carbon
vanes. May need to replace. Check filter, clean if needed.
♦Replace gauge.
♦ Remove & Clean with carburetor cleaner,
dry thoroughly. Do Not Use.
♣ Replace carbon canes.
• Remove cover, clean rust with emery cloth.
♦Clean filter. Using vent port-reprime pump (See Figure 6 & 7)
♣Refill Storage.
♣Clean pump screen-Remove pump cover. Using vent
port, reprime pump. (See figure 6 & 7)
•Remove nozzle and check for foreign objects. (See Figure 9 and 11)
•Aluminum Block Pre-heater inside burner should not build
up carbon. If carbon is present, pre-heat circuit is
malfunctioning. Thermocouple heat sensor wire could
have open circuit. Heat control board may have blown
circuit and circuit board fuse. Inspect both and replace
either if needed. (See Figure 11).
•Close air band—while viewing flame; open air band
slowly until combustion chamber is clear, not orange.
♦Investigate and locate reason for over firing. I.e., nozzle
eroded, pump not functioning properly, decrease pump motor
speed.
Operation, and Service Instructions
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