Additional Faults Without Specific Fault Messages - Watts AERCO Edge CFR 3000 Operator's And Service Manual

SECTION 9 TROUBLESHOOTING
TABLE 9-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Defective switch or Actuator.
3.
Incorrectly wired switch.
4.
Air/Fuel Valve unplugged.
1.
Loose wiring connection to the
2.
stepper motor.
Defective Air/Fuel Valve stepper
3.
motor.
Defective Power Supply Board or
4.
STEPPER
fuse.
MOTOR FAILURE
Defective IGST Board.
5.
Air/Fuel Valve out of calibration
6.

9.2 Additional Faults Without Specific Fault Messages

Refer to Table 9-2 to troubleshoot faults that occur without a specific fault message displayed.
TABLE 9-2: Boiler Troubleshooting with No Fault Message Displayed
Fault
Hard Light-Off
Fluctuating Gas
Pressure
The following Unit Status messages are related to the CFR boiler's Stack Guard operation:
•
Probable Causes
Clogged/damaged Gas
1.
Injector on Igniter-
Injector (Figure 8-1a
through Figure 8-1c).
Defective Staged Ignition
2.
Solenoid (Figure 8-1a
through Figure 8-1c).
Gas pressure going into
1.
unit is fluctuating.
Damping Orifice not
2.
installed.
•
Corrective Action
Remove the electrical cover from the SSOV and
3.
check switch continuity. If the switch does not
show continuity with the gas valve closed, either
adjust or replace the switch or actuator.
Ensure that the SSOV Proof of Closure switch is
4.
correctly wired.
Check that the Air/Fuel Valve is connected to the
1.
Edge Controller.
Inspect for loose connections between the
2.
Air/Fuel Valve motor and the wiring harness.
Replace stepper motor.
3.
Check DS1 & DS2 LEDs on Power Supply Board. If
4.
they are not steady ON, replace Power Supply
Board.
Check "Heartbeat" LED DS1 and verify it is
5.
blinking ON & OFF every second. If not, replace
IGST Board.
Perform the stepper motor calibration procedure
6.
(Main Menu à Diagnostics à Subsystems à Air
Fuel Valve Stepper
Corrective Action
Disconnect the Staged Ignition Assembly solenoid
1.
from the Gas injector Tube of the Igniter-Injector
(Figure 8-1a through Figure 8-1c) and inspect Gas
Injector to ensure it is not clogged or damaged.
Close the Manual Shutoff Valve. Attempt to start
2.
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.
Stabilize gas pressure going into unit. If necessary,
1.
troubleshoot Building Supply Regulator.
Check if the gas train is supposed to have a
2.
Damping Orifice, and if so, ensure that it is
installed in the SSOV Actuator, as shown in Figure
10-1, below. For DBB Gas Trains, the Damping
Orifice is installed in the downstream SSOV
Actuator).
•
Motor).