AERCO Innovation (G-13-1854 and above) - Manual (Page 98)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 7 – TROUBLESHOOTING GUIDE
Page 98 of
196 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0078_0J
PRI: 11/22/2013
Phone: 800-526-0288
GF-128
TABLE 7-1. WATER HEATER TROUBLESHOOTING – Continued
STEPPER MOTOR
FAILURE
1. Air/Fuel Valve out of calibration.
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
1. Perform Stepper Test per GF-112 (para. 6.3.5) to ensure
stepper motor rotates properly from 0% (fully closed) to
100% (fully open) positions. Verify VALVE POSITION
bargraph and dial on the Air/Fuel Valve track each other to
indicate proper operation. If operation is not correct,
perform the Stepper Feedback Calibration (GF-112,
section 6.2.1).
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.
WARNING EXHAUST
TEMP HIGH
(Flashing WARNING)
1. Poor combustion calibration
2. Heat exchanger has scale.
1. Check combustion calibration using procedures in Chapter
4.
2. Clean heat exchanger using procedures in Chapter 6.