AERCO BMK 1500-2000 - Manual (Page 99)

Benchmark 1500 - 2000 Boilers
CHAPTER 8 – TROUBLESHOOTING GUIDE
OMM-0097_0D
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 99 of 188
GF-142
Ph.: 800-526-0288
TABLE 8-1: BOILER TROUBLESHOOTING
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
AIRFLOW FAULT
DURING IGNITION 1. Blower stopped running due to thermal
or current overload.
2. Blocked Blower inlet or inlet air filter.
3. Blockage in Blower Proof switch.
4. Blockage in Blocked Inlet switch.
5. Defective Blower Proof switch.
6. Defective Blocked Inlet switch.
7. Loose temperature to AUX connection in
I/O Box.
8. Defective temperature sensor.
9. Loose wire connection between the 0-
10V signal from I/O box to the Blower
input.
10. Defective I/O Box.
11. Wrong 0-10V output selection on the
control box.
12. Defective Air-Fuel Valve potentiometer.
13. Hard light.
1. Check combustion blower for signs of excessive heat or high
current drain that may trip thermal or current overload devices.
2. Inspect the inlet to the combustion blower including the air
filter at the air/fuel valve for signs of blockage.
3. Remove the Blower Proof switch and inspect for signs of
blockage, clean or replace as necessary.
4. Remove the Blocked Inlet switch and inspect for signs of
blockage, clean or replace as necessary.
5. Check the continuity of the Blower Proof switch with the
combustion blower running. If there is an erratic resistance
reading or the resistance reading is greater than zero ohms,
replace the switch.
6. Turn off unit and check the continuity of the Blocked Inlet
switch. If there is an erratic resistance reading or the
resistance reading is greater than zero ohms, replace the
switch.
7. Check the actual inlet air temperature and measure voltage at
AUX input in the I/O Box. Verify that the voltage conforms to
the values shown in the tabular listing provided in Appendix C.
8. Refer to CORRECTIVE ACTION 7 and verify that the voltage
conforms to the values shown in Appendix C.
9. Check wire connection from I/O Box 0-10V signal to the
Blower Motor.
10. Measure voltage at the I/O box 0-10V output. A voltage of
10V equates to a 100% open valve position.
11. Check the Analog Out option on the C-More Configuration
Menu. Valve Position 0-10V should be selected.
12. Check Air/Fuel Valve position at 0%, 50% and 100% open
positions. The positions on the VALVE POSITION bargraph
should match the readings on the Air/Fuel Valve dial.
13. Check igniter-injector for soot or erosion of electrode. Check
injector solenoid valve to insure proper open/close operation.