22
Indicator light is on.
Cad cell is defective, sees external light, or connections
have shorted. Go to step 4.
3. Check indicator light with
burner off, no call for heat (no
flame).
Indicator light is off.
Go to step 5.
Indicator light turns off.
Eliminate external light source or permanently shield cad
cell.
4. Shield cad cell from external
light.
Indicator light stays on.
•
Replace cad cell with new cad cell and recheck.
•
If indicator light does not turn off, remove yellow
leadwires 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.
Burner starts.
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
5. Jumper thermostat (T -T)
terminals on R7184
IMPORTANT
First remove one thermostat lead
wire.
Burner does not start.
If burner still doesn't start, check the oil burner motor. It
may be seized or burned out.
Condition: Burner starts then locks out on safety with indicator light flashing at 1 Hz rate (½ second on, ½ second off)
Procedure Status
Corrective
Action
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)
- - -
- - -
Indicator light is on.
Cad cell or controller is defective, sees external light, or
connections are shorted. Go to step 4.
3. Check indicator light with
burner off, no call for heat (no
flame).
Indicator light is off.
Go to step 5.
Continues on next page
Summary of Contents for P2HMX12F08001
Page 16: ...16 APPENDIX B WIRING DIAGRAM ...
