LAARS MAX 165 (DV) - Installation, Operation and Maintenance Instructions - 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.