Watts AERCO Benchmark BMK5000 Operation And Service Manual page 132

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Blower stopped running due to thermal or
1.
current overload.
Blocked Blower inlet or inlet air filter.
2.
Blockage in Blower Proof switch.
3.
Blockage in Blocked Inlet switch.
4.
Defective Blower Proof switch.
5.
Defective Blocked Inlet switch.
6.
AIRFLOW
FAULT
DURING
7. Bad inlet air temperature sensor.
IGNITION
Defective temperature sensor.
8.
Loose wire connection between the Blower
9.
and the Controller.
Defective Air-Fuel Valve potentiometer.
10.
Hard light.
11.
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Corrective Action
Check combustion blower for signs of excessive heat or high
1.
current drain that may trip thermal or current overload devices.
Inspect the inlet to the combustion blower including the air filter at
2.
the air/fuel valve for signs of blockage.
Remove the Blower Proof switch and inspect for signs of blockage,
3.
clean or replace as necessary.
Remove the Blocked Inlet switch and inspect for signs of blockage,
4.
clean or replace as necessary.
Check the continuity of the Blower Proof switch with the
5.
combustion blower running. If there is an erratic resistance reading
or the resistance reading is greater than zero ohms, replace the
switch.
Turn off unit and check the continuity of the Blocked Inlet switch. If
6.
there is an erratic resistance reading or the resistance reading is
greater than zero ohms, replace the switch.
Check the actual inlet air temperature reading and measure
7.
resistance at the Sensor Harness connection P1. Verify that the
reading conforms to the values shown in Section 2 of the
Benchmark Platinum-Edge: REFERENCE Manual (GF-212).
Refer to CORRECTIVE ACTION 7 and verify that the voltage
8.
conforms to the values shown in Section 2 of the Benchmark
Platinum-Edge: REFERENCE Manual (GF-212).
Check wire connection from the Blower motor to the Secondary
9.
Power Panel.
Check Air/Fuel Valve position at 0%, 50% and 100% open
10.
positions. The positions on the Valve Position bar graph should
match the readings on the Air/Fuel Valve dial.
Check igniter-injector for soot or erosion of electrode. Check
11.
injector solenoid valve to insure proper open/close operation.
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