Watts Aerco INN 1060N - Page 106

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 106 of 170
TABLE 7-1. WATER HEATER TROUBLESHOOTING
FAULT INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
PRG SWITCH
CLOSED DURING
IGNITION
(continued)
3. Switch wired incorrectly.
3. 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.
PRG SWITCH OPEN
DURING PURGE
1. Defective purge switch.
1. If the air-fuel valve does rotate, check purge switch for continuity
when closing. Replace switch if continuity does not exist.
2. No voltage present at switch.
2. Measure for 24 VAC from each side of the switch to ground. If
24VAC is not present, refer fault to qualified service personnel.
3. Switch wired incorrectly.
3. Check to ensure that the switch is wired correctly (correct wire
numbers on the normally open terminals).
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.
OUTDOOR TEMP
SENSOR FAULT
1. Loose or broken wiring.
1. Inspect Outdoor Temperature sensor for loose or broken wiring.
2. Defective Sensor.
2. Check resistance of sensor to ensure it is within specification.
3. Incorrect Sensor.
3. Ensure that the correct sensor is installed.
RECIRC PUMP
FAILURE
1. Internal recirculation pump failed.
1. Replace recirculation pump.
REMOTE SETPT
SIGNAL FAULT
1. Remote setpoint signal not present:
– Not yet installed.
– Wrong polarity.
– Signal defective at source.
– Broken or loose wiring.
1. Check I/O Box to ensure signal is hooked up.
– Hook up if not installed.
– If installed, check polarity.
– Measure signal level.
– Check continuity of wiring between source and unit.
2. Signal is not isolated (floating) if 4 to
20 mA.
2. Check signal at source to ensure it is isolated.
3. Edge Controller signal type selection
switches not set for correct signal type
(voltage or current).
3. Check DIP switch on the Controller’s Interface board (behind the
display) to ensure it is set correctly for the type of signal being
sent. Check control signal type set in Main Menu → Advanced
Setup → Unit → Application Configuration.