Watts Aerco Innovation 800 User Manual page 102

Innovation Hot Water Hot Water Boiler User Manual
TABLE 7-1. HOT WATER BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
STEPPER MOTOR
1.
FAILURE
2.
3.
4.
5.
6.
WARNING EXHAUST
1.
TEMP HIGH
(Flashing WARNING)
2.
Page 102 of 174
11/15/2016
CHAPTER 7 – TROUBLESHOOTING GUIDE
PROBABLE CAUSES
Air/Fuel Valve out of calibration.
Air/Fuel Valve unplugged.
Loose wiring connection to the
stepper motor.
Defective Air/Fuel Valve stepper
motor.
Defective Power Supply Board or
fuse.
Defective IGST Board.
Poor combustion calibration
Heat exchanger has scale.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
- INTERNATIONAL
CORRECTIVE ACTION
Perform Stepper Test per GF-112 (section 6.3.5) to ensure
1.
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).
Check that the Air/Fuel Valve is connected to the Control
2.
Box.
.Inspect for loose connections between the Air/Fuel Valve
3.
motor and the wiring harness.
Replace stepper motor.
4.
Check DS1 & DS2 LEDs on Power Supply Board. If they are
5.
not steady ON, replace Power Supply Board.
Check "Heartbeat" LED DS1 and verify it is blinking ON &
6.
OFF every second. If not, replace IGST Board.
Check combustion calibration using procedures in Chapter
1.
4.
Clean heat exchanger using procedures in Chapter 6.
2.
OMM-0120_0A
GF-128-I