Watts AERCO Benchmark BMK5000 Operation And Service Manual page 133

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Blower not running or running too slow.
1.
Defective Blocked Inlet switch.
2.
Blockage in air filter or Blocked Inlet switch.
3.
AIRFLOW
Blocked blower inlet or inlet ductwork.
4.
FAULT
DURING
PURGE No voltage to Blocked Inlet switch from Edge
5.
Controller.
PROBABLE CAUSES from 3 to 12 for
6.
AIRFLOW FAULT DURING IGNITION apply
for this fault.
Missing or improperly connected Blocked Flue
7.
jumper.
Blower stopped running due to thermal or
1.
current overload.
Blocked Blower inlet or inlet ductwork.
2.
Blockage in air filter or Blocked Inlet switch.
3.
AIRFLOW
FAULT
Defective Blocked Inlet switch.
4.
DURING RUN
Combustion oscillations.
5.
Probable causes from 3 to 16 for AIRFLOW
6.
FAULT DURING IGNITION applies for this
fault.
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Corrective Action
1. Start the unit. If the blower doesn't run, check the blower solid state
relay for input and output voltage. If OK, check the blower.
Start the unit. If the blower runs, turn off unit and check the Blocked
2.
Inlet switch for continuity. Replace the switch if continuity does not
exist.
Remove the air filter and Blocked Inlet switch and inspect for signs
3.
of blockage. Clean or replace as necessary.
Inspect the inlet to the combustion blower including any ductwork
4.
leading up to the combustion blower for signs of blockage.
During the start sequence, verify that 24 VAC is present between
5.
each side of the switch and ground. If 24 VAC is not present, refer
fault to qualified service personnel.
See CORRECTIVE ACTIONS for AIRFLOW FAULT DURING
6.
IGNITION, items 3 to 12.
Check auxiliary box to be sure Blocked Flue input is jumpered and
7.
properly connected.
Check blower for signs of excessive heat or high current draw that
1.
may trip thermal or current overload devices.
Inspect the inlet to the blower, including any ductwork leading up
2.
to the combustion blower, for signs of blockage.
Remove the air filter and Blocked Inlet switch and inspect for signs
3.
of blockage, clean or replace as necessary.
Verify that 24 VAC is present between each side of the switch and
4.
ground. If 24 VAC is not present at both sides, replace switch.
Run unit to full fire. If the unit rumbles or runs rough, perform
5.
combustion calibration.
See CORRECTIVE ACTIONS from 3 to 12 for AIRFLOW FAULT
6.
DURING IGNITION.
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