Watts Aerco INN 1060N - Page 104

Innovation - Edge [i] Installation, Operation, Maintenance Manual
CHAPTER 7 – TROUBLESHOOTING GUIDE
OMM-0143_A • GF-216 • 9/6/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 104 of 170
TABLE 7-1. WATER HEATER TROUBLESHOOTING
FAULT INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
IGN SWITCH CLOSED
DURING PURGE
(continued)
3. Switch wired incorrectly.
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. Defective Power Supply Board or fuse.
4. Check DS1 & DS2 LEDs on Power Supply Board. If they are not
steady ON, replace Power Supply Board.
5. Defective IGST Board.
5. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF
every second. If not, replace IGST Board.
IGN SWITCH OPEN
DURING IGNITION
1. Air/Fuel Valve not rotating to ignition
position.
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 Edge Controller. Refer fault to qualified service personnel.
2. Defective Ignition switch.
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. Defective Power Supply Board or fuse.
3. Check DS1 & DS2 LEDs on Power Supply Board. If they are not
steady ON, replace Power Supply Board.
4. Defective IGST 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.
1. Check for a jumper properly installed across the interlock
terminals in the I/O box.
2. Energy Management System does not
have unit enabled.
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. Device proving switch hooked to
interlocks is not closed.
3. Check that proving switch for any device hooked to the interlock
circuit is closing and that the device is operational.