Nordyne O4HD-091A-12-FA Installation Instructions Manual page 23

Table C-3: R7184 TROUBLESHOOTING
Condition: Burner motor does not start when there is a call for heat.
Procedure
1. Check that limit switches are
closed and contacts are
clean. This includes the
burner motor reset button.
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.
3. Check indicator light with
burner off, no call for heat (no
flame).
4. Shield cad cell from external
light.
5. Jumper thermostat (T -T)
terminals on R7184
IMPORTANT
First remove one thermostat lead
wire.
Condition: Burner starts then locks out on safety with indicator light flashing at 1 Hz rate (½ second on, ½ second off)
Procedure
1. Check that the limit switches
are closed and contacts are
clean.
2. Check for line voltage power
at the oil primary control.
Voltage should be 120 vac
(nominal)
3. Check indicator light with
burner off, no call for heat (no
flame).
Continues on next page
Status
N/A
N/A
Indicator light is on.
Indicator light is off.
Indicator light turns off.
Indicator light stays on.
Burner starts.
Burner does not start.
Status
- - -
- - -
Indicator light is on.
Indicator light is off.
23
Corrective Action
Cad cell is defective, sees external light, or connections
have shorted. Go to step 4.
Go to step 5.
Eliminate external light source or permanently shield cad
cell.
•
Replace cad cell with new cad cell and recheck.
•
If indicator light does not turn off, remove yellow
lead wires from R7184 and recheck.
•
If indicator light is still on, replace the R7184
control.
•
If the indicator light turns off, replace cad cell
bracket assembly.
Trouble is in thermostat circuit. Check thermostat wiring
connections.
If connections are clean and tight, check thermostat wires
for continuity.
•
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 R7184
If burner still doesn't start, check the oil burner motor. It
may be seized or burned out.
Corrective Action
Cad cell or controller is defective, sees external light, or
connections are shorted. Go to step 4.
Go to step 5.
N/A
N/A
- - -
- - -
151B0801 R5 3/28/2006