Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
OMM-0082_0J AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 113 of 192
GF-130 Ph.: 800-526-0288 05/21/2014
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 WATER HEATER TROUBLESHOOTING WITH NO FAULT MESSAGE DISPLAYED
OBSERVED INCIDENT
PROBABLE CAUSES
CORRECTIVE ACTION
Hard Light-Off
1. Staged Ignition Ball Valve closed.
2. Clogged/damaged Gas Injector
on Igniter-Injector (Figure 8-2).
3. Defective Staged Ignition
Solenoid (Figure 8-1).
1. Open the Staged Ignition Ball Valve on the upstream side
of the SSOV (Figure 8-1).
2. Disconnect the Staged Ignition Assembly solenoid from
the Gas injector Tube of the Igniter-Injector (Figure 8-2)
and inspect Gas Injector to ensure it is not clogged or
damaged.
3. Close the Manual Shutoff Valve (Figure 8-1, below ).
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 to ensure that the Damping Orifice is installed in the
SSOV Actuator shown in Figure 8-3. (For IRI (DBB) Gas
Trains, the Damping Orifice is installed in the downstream
SSOV Actuator).
Air/Fuel Valve “hunting” at
the 80% Valve Position
1. IGST and Power Supply Boards
in Control Box are outdated.
1. Check to ensure that the IGST and Power Supply Boards
are Rev. E or higher.