AERCO Innovation (G-10-1350 to G-11-0563) - Manual (Page 84)

GF
-
128
Innovation Series Water Heaters Chapter 7
OMM-0079_0B USER MANUAL Troubleshooting Guide
Page 84 of 200 AERCO International, Inc.
· 100 Oritani Dr. · Blauvelt, NY 10913 · Phone: 800-526-0288
PR1 - 07/21/11
TABL 7-1. WATER HEATER 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.
7.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES
Refer to Table 7-2 to troubleshoot faults which may occur without a specific fault message being displayed.
TABLE 7-2. WATER HEATER TROUBLESHOOTING WITH NO FAULT MESSAGE DISPLAYED
OBSERVED INCIDENT PROBABLE CAUSES CORRECTIVE ACTION
Hard Light-Off 1. Staged Ignition Ball Valve closed.
2. Clogged/damaged Gas Injector on
Igniter-Injector (Figure 7-2).
3. Defective Staged Ignition Solenoid
(Figure 7-2)
1. Open the 1/4” Staged Ignition Ball Valve on the downstream side
of the SSOV (Figure 7-1).
2. Disconnect the Staged Ignition Assembly from the Igniter-
Injector and inspect Gas Injector to ensure it is not clogged or
damaged.
3. Close the 1” Manual Shutoff Valve and the 1/4” Ball Valve that
connects to the flex hose of the Staged Ignition Assy. (Figure 7-
1). 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.
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 shown in Figure 7-3. (For IRI Gas Trains, the
Damping Orifice is installed in the downstream SSOV Actuator).
Air/Fuel Valve “hunting” at the
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Control Box are outdated.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.