Centurion Water Heater- Edge [ii]: Install-Operation-Service
SECTION 10: TROUBLESHOOTING
OMM-0153_A
• 8/25/2022 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 111 of 131
Centurion Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
3.
Defective Air/Fuel Valve
stepper motor.
3.
Replace stepper motor.
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.
6.
Air/Fuel Valve out of
calibration
6.
Perform the stepper motor calibration procedure
(Main Menu
→
Diagnostics
→
Subsystems
→
Air
Fuel Valve Stepper Motor).
10.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES
Refer to Table 12.2 to troubleshoot faults which may occur without a specific fault message
being displayed.
TABLE 12.2: Water Heater Troubleshooting with No Fault Message Displayed
Observed
Incident
Probable Causes
Corrective Action
Hard Light-Off
1.
Clogged/damaged Gas
Injector on Igniter-
Injector (Figure 7.2-1).
1.
Disconnect the Staged Ignition Assembly solenoid from the
Gas injector Tube of the Igniter-Injector (Figure 7.2-1) and
inspect Gas Injector to ensure it is not clogged or damaged.
2.
Defective Staged Ignition
Solenoid (Figure 7.2-1).
2.
Close the Manual Shutoff Valve. Attempt to start the unit
and listen for a “clicking” sound that the Staged Ignition
Solenoid makes during Ignition Trial. If “clicking” sound is
not heard after 2 or 3 attempts, replace the Staged Ignition
Solenoid.
Fluctuating
Gas Pressure
1.
Gas pressure going into
unit is fluctuating.
1.
Stabilize gas pressure going into unit. If necessary,
troubleshoot Building Supply Regulator.
2.
Damping Orifice not
installed.
2.
Check if the gas train is supposed to have a Damping
Orifice, and if so, ensure that it is installed in the SSOV
Actuator, as shown in Figure 10.2-3, below.