OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 105 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 10: TROUBLESHOOTING
Centurion Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
2.
No voltage present at
switch.
2.
Measure for 24 VAC from each side of the switch to
ground. If 24 VAC is not present, refer fault to
qualified service personnel.
3.
Switch wired incorrectly.
3.
Check to ensure that the switch is wired correctly
(correct wire numbers on the normally open
terminals).
4.
Defective Power Supply
Board or fuse.
4.
Check DS1 & DS2 LEDs on Power Supply Board. If
they are not steady ON, replace Power Supply
Board.
5.
Defective IGST Board.
5.
Check “Heartbeat” LED DS1 and verify it is blinking
ON & OFF every second. If not, replace IGST Board.
OUTDOOR
TEMP SENSOR
FAULT
1.
Loose or broken wiring.
1.
Inspect Outdoor Temperature sensor for loose or
broken wiring.
2.
Defective Sensor.
2.
Check resistance of sensor to determine if it is
within specification.
3.
Incorrect Sensor.
3.
Ensure that the correct sensor is installed.
RECIRC PUMP
FAILURE
1.
Internal recirculation pump
failed.
1. Replace recirculation pump.
REMOTE SETPT
SIGNAL FAULT
1.
Remote setpoint signal not
present:
•
Not yet installed.
•
Wrong polarity.
•
Signal defective at source.
•
Broken or loose wiring.
1.
Check I/O Box to ensure signal is hooked up.
•
Hook up if not installed.
•
If installed, check polarity.
•
Measure signal level.
•
Check continuity of wiring between source and unit.
2.
Signal is not isolated
(floating) if 4 to 20 mA.
2.
Check signal at source to ensure it is isolated.
3.
Edge Controller signal type
selection switches not set
for correct signal type
(voltage or current).
3.
Check DIP switch on PMC board to ensure it is set
correctly for the type of signal being sent. Check
control signal type set in the Remote Signal
parameter (Advanced Setup
→
Unit
→
Application
Configuration).
RESIDUAL
FLAME
1.
Defective Flame Detector.
1.
Replace Flame Detector.
2.
SSOV not fully closed.
3.
Wire strand from burner
head in contact with Flame
Detector
2.
Check open/close indicator window of Safety Shut-
Off Valve (SSOV) and ensure that the SSOV is fully
closed. If not fully closed, replace the valve and or
actuator.
Close the Gas Shut-Off Valve downstream of SSOV.
Install a manometer or gauge at the leak detection
port between the SSOV and Gas Shut Off Valve. If a gas
pressure reading is observed replace the SSOV Valve
and/or Actuator.
3.
Ensure Flame Detector is in good condition and is
not tilted inward toward burner head.
SSOV FAULT
DURING PURGE
See SSOV SWITCH OPEN