Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
Page
106
of
192
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0082_0J
05/21/2014
Ph.: 800-526-0288
GF-130
TABLE 8-1. BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
FLAME LOSS
DURING IGN
(continued)
6.
Carbon or other debris on
Burner.
7.
Staged ignition solenoid valve
doesn’t open.
8.
Clogged staged ignition piece.
6.
Remove View-Port and inspect Burner with Boroscope. If it
is fouled or black with soot, remove the Burner and inspect
for any carbon build-up or debris. Clean and reinstall.
7.
When unit goes to ignition, listen for a clicking sound at the
staged ignition solenoid valve to ensure it is opening.
8.
Remove and inspect the igniter-injector and inspect the
gas injector for blockage.
FLAME LOSS
DURING RUN
1.
Worn Flame Detector or cracked
ceramic.
2.
Defective Regulator.
3.
Poor combustion calibration.
4.
Debris on burner.
5.
Blocked condensate drain.
1.
Remove and inspect the Flame Detector for signs of wear
or cracked ceramic. Replace if necessary.
2.
Check gas pressure readings using a gauge or manometer
into and out of the Air/Fuel Valve to ensure that the gas
pressure into and out of the valve is correct.
3.
Check combustion calibration using procedures in Chapter
4.
4.
Remove the burner and inspect for any carbon build-up or
debris. Clean and reinstall.
5.
Remove blockage in condensate drain.
HEAT DEMAND
FAILURE
1.
The Heat Demand Relays on the
Ignition/Stepper (IGST) board
failed to activate when
commanded.
2.
Relay is activated when not in
Demand.
1.
Press
CLEAR
button and restart the unit. If the fault
persists, replace Ignition/Stepper (IGST) Board.
2.
Defective relay. Replace IGST Board.
HIGH EXHAUST
TEMPERATURE
1.
Poor combustion calibration.
2.
Carboned heat exchanger due to
incorrect combustion calibration
1.
Check combustion calibration using procedures in Chapter
4.
2.
If exhaust temperature is greater than 200
o
F, check
combustion calibration. Calibrate or repair as necessary.
