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 74 of 148
TABLE 5-1: Boiler Troubleshooting Procedures
FAULT
INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
SSOV
SWITCH OPEN
1.
Actuator not allowing for full closure of gas
valve.
2.
SSOV powered when it should not be.
3.
Defective switch or Actuator.
4.
Incorrectly wired switch.
1.
Observe operation of the Safety Shut-Off Valve (SSOV) through
indicator on the Valve actuator and ensure that the valve is fully
and not partially closing.
2.
If the SSOV never closes, it may be powered continuously. Close
the gas supply and remove power from the unit. Refer fault to
qualified service personnel.
3.
Remove the electrical cover from the SSOV and check switch
continuity. If the switch does not show continuity with the gas valve
closed, either adjust or replace the switch or actuator.
4.
Ensure that the SSOV Proof of Closure switch is correctly wired.
STEPPER
MOTOR
FAILURE
1.
Air/Fuel Valve out of calibration.
2.
Air/Fuel Valve unplugged.
3.
Loose wiring connection to the stepper motor.
4.
Defective Air/Fuel Valve stepper motor.
5.
Defective Power Supply Board or fuse.
6.
Defective IGST Board.
1.
Refer to C-More User Manual, OMM-0032 (GF-112) and perform
the Stepper Feedback Calibration procedure in Section 6.2.1 in
that manual.
2.
Check that the Air/Fuel Valve is connected to the C-More
Controller.
3.
.Inspect for loose connections between the Air/Fuel Valve motor
and the wiring harness.
4.
Replace stepper motor.
5.
Check DS1 & DS2 LEDs on Power Supply Board. If they are not
steady ON, replace Power Supply Board.
6.
Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF
every second. If not, replace IGST Board.
SSOV FAULT
DURING
IGNITION
1.
SSOV didn’t open
1.
Check pilot assembly for carbon buildup.
2.
Check scanners sensed pilot flame.
3.
Check power through ignition relay.
4.
Scanners close neutral side of relay coil.
