Benchmark 1500 - 2000 Boilers
CHAPTER 8 – TROUBLESHOOTING GUIDE
Page 108 of 182 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0E
10/01/2015 Ph.: 800-526-0288 GF-142
TABLE 8-1: BOILER TROUBLESHOOTING – Continued
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
IGN SWTCH CLOSED
DURING PURGE
1. Air/Fuel Valve not rotating.
2. Defective or shorted switch.
3. Switch wired incorrectly.
4. Defective Power Supply Board
or fuse.
5. Defective IGST Board.
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 Control Box. Refer to qualified service personnel.
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. 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.
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.
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