Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 5
– TROUBLESHOOTING GUIDE
OMM-0118_B
•
GF-203
•
5/9/2019
Technical Support
•
(800) 526-0288
•
Mon-Fri, 8 am - 5 pm EST Page 75 of 148
5.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES
Refer to Table 5-2 to troubleshoot faults which may occur without a specific fault message being displayed.
TABLE 5-2: Boiler Troubleshooting Procedures with No Fault Message Displayed
OBSERVED INCIDENT
PROBABLE CAUSES
CORRECTIVE ACTION
HARD LIGHT-OFF
1.
Clogged/damaged Gas Injector on
Igniter-Injector (Figure 5-1).
2.
Defective Ignition Solenoid (Figure
5-1).
3.
Pilot Regulator not calibrated
correctly.
1.
Disconnect the Ignition Assembly solenoid from the Gas injector Tube
of the Igniter-Injector (Figure 8-1) and inspect Gas Injector to ensure it
is not clogged or damaged.
2.
Close the 2” Manual Shutoff Valve. Attempt to start the unit and listen
for a “clicking” sound that the Ignition Solenoid makes during Ignition
Trial. If “clicking” sound is not heard after 2 or 3 attempts, replace the
Ignition Solenoid.
3.
Refer to Section 4.5.2, above, and check the calibration of the Pilot
Regulator.
FLUCTUATING GAS
PRESSURE
1.
Gas pressure going into unit is
fluctuating.
2.
Damping Orifice not installed.
1.
Stabilize gas pressure going into unit. If necessary, troubleshoot
Building Supply Regulator.
2.
Check to ensure that the Damping Orifice is installed in the SSOV
Actuator shown in Figure 5-3. (For DBB Gas Trains, the Damping
Orifice is installed in the downstream SSOV Actuator).
Air/Fuel Valve “hunting” at
the 70% Valve Position
1.
IGST and Power Supply Boards in
C-More Controller are outdated.
1.
Check to ensure that the IGST and Power Supply Boards are Rev. E
or higher.
