Additional Faults Without Specific Fault Messages - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

8.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES

Refer to Table 8-2 to troubleshoot faults which may occur without a specific fault message being displayed.
TABLE 8-2: HEATING BOILER TROUBLESHOOTING WITH NO FAULT MESSAGE DISPLAYED
OBSERVED INCIDENT
Hard Light-Off
Fluctuating Gas Pressure
Air/Fuel Valve "hunting" at
the 80% Valve Position
OMM-0119_0A
GF-130-I
CHAPTER 8 – TROUBLESHOOTING GUIDE
PROBABLE CAUSES
Clogged/damaged Gas Injector
1.
on Igniter-Injector (Figure 8-2).
Defective Staged Ignition
2.
Solenoid (Figure 8-2).
Gas pressure going into unit is
1.
fluctuating.
Damping Orifice not installed.
2.
IGST and Power Supply Boards
1.
in Control Box are outdated.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
CORRECTIVE ACTION
Disconnect the Staged Ignition Assembly solenoid from
1.
the Gas injector Tube of the Igniter-Injector (Figure 8-2)
and inspect Gas Injector to ensure it is not clogged or
damaged.
Close the 2" Manual Shutoff Valve. Attempt to start the unit
2.
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.
Stabilize gas pressure going into unit. If necessary,
1.
troubleshoot Building Supply Regulator.
Check to ensure that the Damping Orifice is installed in the
2.
SSOV Actuator shown in Figure
Check to ensure that the IGST and Power Supply Boards
1.
are Rev. E or higher.
8-3.
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11/03/2016