AERCO BMK 3.0 LN Nat. Gas June 2010 - Manual (Page 69)

TROUBLESHOOTING
8-11
TABLE 8-1. BOILER TROUBLESHOOTING – Continued
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
(continued) 2. Air/Fuel Valve unplugged.
3. Loose wiring connection to the
stepper motor.
4. Defective Air/Fuel Valve stepper
motor.
5. Defective Power Supply Board or
fuse
6. Defective IGST Board
2. Check that the Air/Fuel Valve is connected to the Control Box.
3. Inspect for loose connections between the Air/Fuel Valve motor
and the wiring harness.
4. Replace stepper motor.
5. Check DS1 & DS2 LEDs on Power Supply Board. If they are not
steady ON, replace Power Supply Board.
6. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF
every second. If not, replace IGST Board.
8.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES
Refer to Table 8-2 to troubleshoot faults which may occur without a specific fault message being displayed.
TABLE 8-2. BOILER TROUBLESHOOTING WITH NO FAULT MESSAGE DISPLAYED
OBSERVED INCIDENT PROBABLE CAUSES CORRECTIVE ACTION
Hard Light-Off 1. Staged Ignition Ball Valve closed.
2. Clogged/damaged Ignitor- Injector
(Figure 8-2).
3. Defective Staged Ignition Solenoid
(Figure 8-2)
1. Open the 1/4” Ball Valve downstream of the SSOV (Fig. 8-1).
2. Remove and inspect gas injector to ensure it is not clogged or
damaged.
3. Close the 2” and the 1/4” Ball Valve downstream of the SSOV
(Fig. 8-1). 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.
2. Damping Orifice not installed.
1. Stabilize gas pressure going into unit. If necessary, troubleshoot
Building Supply Regulator.
2. Check to ensure that the Damping Orifice is installed in the
SSOV Actuator (Figure 8-3). For IRI Gas Trains, the Damping
Orifice is installed in the downstream SSOV Actuator.
Air/Fuel Valve “hunting” at 80%
valve position
1. IGST and Power Supply Boards in
Control Box are outdated.
1. Check to ensure that the IGST and Power Supply Boards are
Rev. E or higher.