OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 99 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 10: TROUBLESHOOTING
Centurion Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
AIRFLOW
FAULT DURING
IGNITION
1.
Blower stopped running due
to thermal or current
overload.
1.
Check combustion blower for signs of excessive heat
or high current drain that may trip thermal or
current overload devices.
2.
Blocked Blower inlet or inlet
air filter.
2.
Inspect the inlet to the combustion blower including
the air filter at the air/fuel valve for signs of
blockage.
3.
Blockage in Blower Proof
switch.
3.
Remove the Blower Proof switch and inspect for
signs of blockage, clean or replace as necessary.
4.
Blockage in Blocked Inlet
switch.
4.
Remove the Blocked Inlet switch and inspect for
signs of blockage, clean or replace as necessary.
5.
Defective Blower Proof
switch.
5.
Check the continuity of the Blower Proof switch with
the combustion blower running. If there is an erratic
resistance reading or the resistance reading is
greater than zero ohms, replace the switch.
6.
Defective Blocked Inlet
switch.
6.
Turn off unit and check the continuity of the Blocked
Inlet switch. If there is an erratic resistance reading
or the resistance reading is greater than zero ohms,
replace the switch.
7.
Bad inlet air temperature
sensor.
7.
Check the actual inlet air temperature reading and
measure resistance at the Sensor Harness
connection P1. Verify that the reading conforms to
the values shown in Appendix B:
Temperature
Sensor Resistance/Voltage Chart
.
8.
Defective temperature
sensor.
8.
Refer to CORRECTIVE ACTION 7 and verify that the
voltage conforms to the values shown in Appendix
B:
Temperature Sensor Resistance/Voltage Chart
.
9.
Loose wire connection
between the Blower and the
Controller.
9.
Check wire connection from the Blower motor to
the Secondary Power Panel.
10.
Defective Air-Fuel Valve
potentiometer.
10.
Check Air/Fuel Valve position at 0%, 50% and 100%
open positions. The positions on the Valve Position
bar graph should match the readings on the Air/Fuel
Valve dial.
11.
Hard light.
11.
Check igniter-injector for soot or erosion of
electrode. Check injector solenoid valve to insure
proper open/close operation.
AIRFLOW
FAULT DURING
PURGE
1.
Blower not running or
running too slow.
1.
Start the unit. If the blower doesn
’
t run, check the
blower solid state relay for input and output
voltage. If OK, check the blower.
2.
Defective Blocked Inlet
switch.
2.
Start the unit. If the blower runs, turn off unit and
check the Blocked Inlet switch for continuity.
Replace the switch if continuity does not exist.
3.
Blockage in air filter or
Blocked Inlet switch.
3.
Remove the air filter and Blocked Inlet switch and
inspect for signs of blockage. Clean or replace as
necessary.
