Watts AERCO Benchmark OMM-0136 - Page 145

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
OMM-0137_E • GF-211 • 12/13/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 145 of 153
TABLE 10-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
2. 32 Pin Ribbon cable defective.
2. Replace 32 Pin Ribbon cable.
IGN SWITCH
CLOSED
DURING
PURGE
1. Air/Fuel Valve not rotating.
1. Start the unit. The Air/Fuel Valve should rotate to the purge (open)
position. If the valve does not rotate at all or does not rotate fully
open, check the Air/Fuel Valve calibration. If calibration is okay,
the problem may be in the Air-Fuel Valve or the Edge Controller.
Refer to qualified service personnel.
2. Defective or shorted switch.
2. If the Air/Fuel Valve does rotate to purge, check the ignition switch
for continuity between the N.O. and COM terminals. If the switch
shows continuity when not in contact with the cam replace the
switch.
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 SWTCH
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 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.