Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 9
– TROUBLESHOOTING
OMM-0145_A99
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149
of
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TABLE 9-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
FLAME
LOSS
DURING
RUN
1.
Worn Flame Detector or
cracked ceramic.
1.
Remove and inspect the Flame Detector for
signs of wear or cracked ceramic. Replace if
necessary.
2.
Defective Regulator.
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.
Poor combustion calibration.
3.
Check combustion calibration using the
procedures in Section 4.4:
Combustion
Calibration
of this
guide.
4.
Debris on burner.
4.
Remove the burner and inspect for any carbon
build-up or debris. Clean and reinstall.
5.
Blocked condensate drain.
5.
Remove blockage in condensate drain.
HEAT
DEMAND
FAILURE
1.
The Heat Demand Relays on
the Ignition/Stepper (IGST)
board failed to activate when
commanded.
1.
Press
CLEAR
button and restart the unit. If
the fault persists, replace Ignition/Stepper
(IGST) Board.
2.
Relay is activated when not in
Demand.
2.
Defective relay. Replace IGST Board.
HIGH
EXHAUST
TEMPERATU
RE
1.
Poor combustion calibration.
1.
Check combustion calibration using
procedures in Section 4.4:
Combustion
Calibration
of this
guide.
2.
Carboned heat exchanger due
to incorrect combustion
calibration.
2.
If exhaust temperature is greater than 200
o
F
(93.3
o
C), check combustion calibration.
Calibrate or repair as necessary.
HIGH GAS
PRESSURE
1.
Incorrect supply gas pressure.
1.
Check to ensure gas pressure at inlet of
SSOV does not
exceed
14” W.C. (3.49 kPa)
.
2.
Defective SSOV Actuator.
2.
If gas supply pressure downstream of SSOV
Actuator cannot be lowered to the range
specified in Table 4-1 (Natural Gas) or Table
4-4 (Propane) in Section 4.4:
Combustion
Calibration
of this
guide; the SSOV Actuator
may be defective.
3.
Defective
High Gas Pressure
switch.
3.
Remove the leads from the High Gas
Pressure switch. Measure continuity across
the common (C) and normally closed (NC)
terminals with the unit not firing. Replace the
switch if continuity does not exist.
HIGH
WATER
1.
Faulty Water temperature
switch.
1.
Test the temperature switch to insure it trips at
its actual water temperature setting.
