Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 5
– TROUBLESHOOTING GUIDE
OMM-0118_B
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GF-203
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5/9/2019
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TABLE 5-1: Boiler Troubleshooting Procedures
FAULT
INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
AIRFLOW
FAULT
DURING
PURGE
1.
Blower not running or running too slow.
2.
Defective Blocked Inlet switch.
3.
Blockage in air filter or Blocked Inlet switch.
4.
Blocked blower inlet or inlet ductwork.
5.
No voltage to Blocked Inlet switch from C-More
Controller.
6.
Probable Causes items 3 to 12 for AIRFLOW
FAULT DURING IGNITION apply for this fault.
1.
Start the unit. If the blower does not run check the blower solid
state relay for input and output voltage. If the relay is OK, check
the blower.
2.
Start the unit. If the blower runs, turn off unit and check the
Blocked Inlet switch for continuity. Replace the switch if continuity
does not exist.
3.
Remove the air filter and Blocked Inlet switch and inspect for signs
of blockage. Clean or replace as necessary.
4.
Inspect the inlet to the combustion blower including any ductwork
leading up to the combustion blower for signs of blockage.
5.
During the start sequence, verify that 24 VAC is present between
each side of the switch and ground. If 24 VAC is not present, refer
fault to qualified service personnel.
6.
See AIRFLOW FAULT DURING IGNITION Corrective Actions
items 3 to 12.
AIRFLOW
FAULT
DURING RUN
1.
Blower stopped running due to thermal or
current overload.
2.
Blocked Blower inlet or inlet ductwork.
3.
Blockage in air filter or Blocked Inlet switch.
4.
Defective Blocked Inlet switch.
5.
Combustion oscillations.
6.
Probable causes from 3 to 16 for AIRFLOW
FAULT DURING IGNITION applies for this
fault.
1.
Check combustion blower for signs of excessive heat or high
current draw that may trip thermal or current overload devices.
2.
Inspect the inlet to the combustion blower, including any ductwork
leading up to the combustion blower, for signs of blockage.
3.
Remove the air filter and Blocked Inlet switch and inspect for signs
of blockage, clean or replace as necessary.
4.
Verify that 24 VAC is present between each side of the switch and
ground. If 24 VAC is not present at both sides, replace switch.
5.
Run unit to full fire. If the unit rumbles or runs rough, perform
combustion calibration.
6.
See CORRECTIVE ACTIONS from 3 to 12 for AIRFLOW FAULT
DURING IGNITION.