Manual

15
Beckett NX BURNER TROUBLESHOOTING
Condition 1: Burner motor does not start when there is a call for heat.
Procedure Status Corrective Action
1. Check that limit switches are closed and
contacts are clean.
N/A N/A
2. Check for line voltage power at the oil
primary control. Voltage should be 120
Vac between the black and white lead
wires on the oil primary control.
N/A N/A
3. Check indicator light with burner off , no
call for heat (no fl ame).
Green Indicator light
is on.
Cad cell is defective, sees external light, or connections have shorted. Go to step
4.
Green Indicator light
is off.
Go to step 6.
4. Shield cad cell from external light.
Green Indicator light
turns off.
Eliminate external light source or permanently shield cad cell.
Green Indicator light
stays on.
Replace cad cell with new cad cell and recheck.
If indicator light does not turn off, remove cad cell lead wires from Aquastat and
recheck.
If indicator light is still on, replace the Aquastat control.
If the indicator light turns off, replace cad cell bracket assembly.
5. Verify that the oil valve is closed during
the valve on delay period by observ-
ing the view port and verifying that no
fl ame is present during the 15-second
valve on delay.
Green Indicator light
is on.
If fl ame is present, replace the oil valve.
6. Jumper thermostat (T -T) terminals on
Aquastat
IMPORTANT
First remove one thermostat lead wire.
Burner starts.
Trouble is in thermostat circuit. Check thermostat-wiring connections.
If connections are clean and tight, check thermostat wires for continuity.
Burner does not start.
• Disconnect line voltage power and open line switch.
• Check all wiring connections.
• Tighten any loose connections and recheck.
• If burner still doesn’t start, replace Aquastat.
If burner still doesn’t start, check the oil burner motor. It may be seized or
burned out.
OPERATION AND TROUBLESHOOTING