Benchmark 750-3000 Boiler Operation & Maintenance Manual
SECTION 5 – TROUBLESHOOTING GUIDE
OMM-0122_D
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GF-206
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5/9/2019
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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 With No Fault Message Displayed
Observed Incident
Probable Causes
Corrective Action
Hard Light-Off
1.
Clogged/damaged Gas Injector
on Igniter-Injector (Figure 4-1a
through Figure 4-1c).
2.
Defective Staged Ignition
Solenoid (Figure 4-1a through
Figure 4-1c).
1.
Disconnect the Staged Ignition Assembly solenoid from the Gas
injector Tube of the Igniter-Injector (Figure 4-1a through Figure 4-1c)
and inspect Gas Injector to ensure it is not clogged or damaged.
2.
Close the Manual Shutoff Valve. Attempt to start the unit and listen for
a “clicking” sound that the Staged Ignition Solenoid makes during
Ignition Trial. If “clicking” sound is not heard after 2 or 3 attempts,
replace the Staged Ignition Solenoid.
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 if the gas train is supposed to have a Damping Orifice, and if
so, ensure that it is installed in the SSOV Actuator shown in Figure 5-
1, below. 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outdated.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.