BMK 5000-6000 Boiler OPERATION-SERVICE-MAINTENANCE GUIDE
SECTION 7 – TROUBLESHOOTING GUIDE
Page
66
of
136
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0124_0A
05/03/2017
Ph.: 800-526-0288
GF-208
TABLE 5-1: BOILER TROUBLESHOOTING PROCEDURES
FAULT
INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
FLAME LOSS
DURING IGN
(continued)
7.
Pilot View Port is blocked.
8.
Carbon or other debris on Burner.
9.
Pilot gas valve is closed.
10.
Pilot ignition solenoid valve does not open.
11.
Clogged Pilot ignition piece
7.
Remove ad clean Pilot View Port. Also, ensure that the hole in the
refractory is clear.
8.
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.
9.
Open the Pilot gas valve on the upstream side of the SSOV (see Figure
5-1).
10.
When unit goes to ignition, listen for a clicking sound at the Pilot
ignition solenoid valve to ensure it is opening.
11.
Remove and inspect staged ignition piece 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.
6.
Main Flame Detector is touching burner mesh.
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 Section 4.5 of the
Benchmark 5000 – 6000 Installation and Startup Guide
, OMM-0123 (GF-
207)
.
4.
Remove the burner and inspect for any carbon build-up or debris.
Clean and reinstall.
5.
Remove blockage in condensate drain.
6.
Straighten or replace Main Flame Detector
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 calibration using procedures in Section 4.5 of the
Benchmark
5000 – 6000 Installation and Startup Guide
, OMM-0123 (GF-207)
.
2.
If exhaust temperature is greater than 200
o
F (93.3
o
C), check
combustion calibration. Calibrate or repair as necessary.
