LAARS MAX 165 (DV) - Installation, Operation and Maintenance Instructions User Manual
Page 21

MAX Oil-Fired Boiler
Page 21
Table 4. Troubleshooting.
FAULT
BURNER
DOES NOT
START
BURNER RUNS
BUT FLAME NOT
ESTABLISHED
FLAME
ESTABLISHED
THEN BURNER
LOCKS OUT
BURNER
PULSATES
POSSIBLE CAUSE
ACTION
Primary safety control tripped
Press reset button on control.
Note: ONLY PRESS ONCE.
High limit thermostat or blocked vent switch
Press reset button on both controls.
tripped (MAX only)
Thermostat satisfied
Turn thermostat to a higher setting.
Fuse blown or breaker tripped
Fit new fuse or reset breaker. If it blows again,
check for short circuit.
Check voltage at burner between orange
If voltage confirmed replace primary control.
and white wires
If no voltage check t-stat and wiring connects.
Motor or fuel pump seized
Turn off power to burner and rotate by hand.
Replace if necessary.
Cad. cell dirty or faulty
Clean face or replace cell.
No oil supply
Check oil level in tank and oil supply to burner.
Water in oil tank
Drain water from tank and bleed line to burner.
Nozzle plugged
Replace with nozzle specified in manual.
Ignition transformer faulty
Check quality of spark and replace transformer
if necessary.
Electrodes carboned or shorting
Clean electrode and check settings.
MAX-DV blocked vent or air intake
Clear debris from around vent terminal.
Faulty oil valve
Replace valve.
Too much combustion air
Reduce air setting to obtain 11 to 12% CO
2
.
Low oil pressure
Check pump pressure and adjust to 140 psi.
Water in oil tank
Drain water from tank and bleed line to burner.
Oil filter or pump strainer plugged
Replace filter cartridge and clean strainer.
Too much or too little combustion air
Adjust air control to obtain 11 to 12% CO
2
.
Air trapped in fuel pump
Bleed off air from pressure gauge port.
Low oil pressure
Check pump pressure and adjust to 140 psi.
Lack of combustion air
Check terminal for block at air intake screens.
Terminal fouled with debris at flue gas outlet
Remove end cap and clean outlet.
Incorrect air setting
Adjust air control to obtain 11 to 12% CO
2
.
Air leakage into fuel system
Bleed pump and seal air leaks.
Water in oil tank
Drain water from tank oil at burner.
Incorrect pump pressure
Check oil pressure and adjust to 140 psi.
Pump coupling worn or broken
Replace coupling.
Nozzle partially pluggeD
Replace with nozzle specified in manual.
Boiler flue ways fouled
Brush out all flue deposits.