AERCO Innovation (G-14-2265 and above) - Manual (Page 104)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 7 – TROUBLESHOOTING GUIDE
Page 104 of 206 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0078_0L
PRI: 11/25/2014
Phone: 800-526-0288
GF-128
TABLE 7-1. WATER HEATER TROUBLESHOOTING – Continued
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
(continued) 3. Switch wired incorrectly
4. Defective Power Supply Board or
fuse
5. Defective IGST Board
3. Check to ensure that the switch is wired correctly (correct wire
numbers on the normally open terminals). If the switch is
wired correctly, replace the switch
4. Check DS1 & DS2 LEDs on Power Supply Board. If they are
not steady ON, replace Power Supply Board.
5. Check “Heartbeat” LED DS1 and verify it is blinking ON &
OFF every second. If not, replace IGST Board
IGN SWTCH OPEN
DURING IGNITION
1. Air/Fuel Valve not rotating to
ignition position.
2. Defective ignition switch
3. Defective Power Supply Board or
fuse
4. Defective IGST Board
1. Start the unit. The Air/Fuel Valve should rotate to the purge
(open) position, then back to ignition position (towards closed)
during the ignition cycle. If the valve does not rotate back to
the ignition position, check the Air/Fuel Valve calibration. If
calibration is okay, the problem may be in the Air/Fuel Valve
or the Control Box. Refer fault to qualified service personnel.
2. If the Air/Fuel Valve does rotate to the ignition position, check
the ignition position switch for continuity between the N.O.
and COM terminals when in contact with the cam.
3. Check DS1 & DS2 LEDs on Power Supply Board. If they are
not steady ON, replace Power Supply Board.
4. Check “Heartbeat” LED DS1 and verify it is blinking ON &
OFF every second. If not, replace IGST Board.
INTERLOCK
OPEN
1. Interlock jumper not installed or
removed
2. Energy Management System
does not have unit enabled.
3. Device proving switch hooked to
interlocks is not closed.
1. Check for a jumper properly installed across the interlock
terminals in the I/O box.
2. If there are two external wires on these terminals check any
Energy Management system to see if they have the units
disabled (a jumper may be temporarily installed to see if the
interlock circuit is functioning).
3. Check that proving switch for any device hooked to the
interlock circuit is closing and that the device is operational.