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Troubelshooting O23 / OHR23 / OF23 −5 Units Cont.
CONDITION 2: BURNER STARTS, THEN LOCKS OUT ON SAFETY WITH LED FLASHING 1/2 SECOND ON
1/2 SECOND OFF
2.1 Check limit switch contacts are
closed and clean.
Clean contacts. Replace limit switch if necessary.
2.2 Check for line votage at oil pri
mary control. Voltage should be
120V
Check primary voltage source. Take appropiate measures to cor
rect if necessary.
2.3 Check LED light with burner off,
no call for heat (no flame)
LED is on
Cad cell or control is bad. Control sees external light or connections
are shorted. See step 2.4.
no call for heat (no flame)
LED is off
See step 2.5.
LED is off
Eliminate exteranl light or shield light from cad cell
2.4 Sheild cad cell from external
light
LED stays on
Replace cad cell and recheck.
If LED stays on remove cad cell lead wires from burner control
and recheck.
If LED turns off, replace cad cell bracket assembly.
If LED stays on replace buner control
2.5 On warm air systems, Remove
one thermostat lead and jumper
Burner energizes
Trouble in thermostat or limit circuit. Check thermostat or limit wir
ing connections.
one thermostat lead and jumper
thermostat (T to T) terminals on
burner control.
Burner does not energize
Disconnect line voltage power and open line switch
Check all wiring and tighten any loose connections. Recheck
If burner does not energize replace burner control
2 6 Hit reset button on burner con
LED stops flashing
See step 2.7.
2.6 Hit reset button on burner con
trol
LED continuse to flash
Verify burner control is not in restricted mode.
(1/2 second flash)
Ignitor could be bad Check line voltage at ignitor terminals If line
Ignition is off
Ignitor could be bad. Check line voltage at ignitor terminals. If line
voltage is present replace burner control
Ignition is off
voltage is present, replace burner control
2.7 Listen for spark after burner en
ergizes (after 2 second delay)
Ignition is on
ergizes (after 2 second delay)
Ignition is on but no oil is
sprayed to combustion cham
ber
Wait for 15 second pre−purge to complete. Check oil valve, oil valve
wiring, pump and oil supply.
2.8 Check LED after flame is estab
lished, but before buner control
lockcs out.
LED is on until the burner
control locks out and starts
flashing during lock out.
Replace burner control
2.9 Check cad cell sighting for view
of flame
Disconnect line voltage and open
line switch
Unplug cad cell and clean cad cell
Burner locks out
See step 2.10
Unplug cad cell and clean cad cell
face with soft cloth. Check sighting
for clear view of flame. Place cad
cell back in socket.
Burner continuse to run
System is O K
cell back in socket.
Reconnect line voltage and close
line switch.
Start burner
Burner continuse to run
System is O.K
2.10 Check cad cell.
Disconnect line voltage and open
line switch
Replace cad cell with new cad cell
LED is on.
Go back to step 2.6
Replace cad cell with new cad cell
Disconnect all wires from thermo
stat to prevent a call for herat.
Reconnect line voltage and close
LED is off
See step 2 11
Reconnect line voltage and close
line switch.
Expose new cad cell to bright light,
such as a flash light
LED is off.
See step 2.11
2.11 Check cad cell bracket assem
bly.
Disconnect line voltage and open
line switch
LED is on.
Replace cad cell assembly.
line switch
Remove cad cell wires from quick
connect connectors on the burner
control and leave wires open.
LED is off
Replace burner control
control and leave wires open.
Apply power to buner control.
Place jumper across cad cell termi
nals after buner motor is energized.
LED is off.
Replace burner control.