Aerco KC Series Instruction Manual download pdf (Page 58)

100

101

TROUBLESHOOTING

8-2

TABLE 8-1. BOILER TROUBLESHOOTING

FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION

AIRFLOW FAULT

DURING IGNITION

1. Blower stopped running due to thermal

or current overload

2. Blocked Blower inlet or inlet ductwork

3. Blocked airflow switch

4. Defective airflow switch

1. Check combustion blower for signs of excessive heat or high

current drain 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 airflow switch and inspect for signs of blockage,

clean or replace as necessary.

4. Measure the airflow switch for continuity with the combustion

blower running. If there is an erratic resistance reading or the

resistance reading is greater than zero ohms, replace the switch.

AIRFLOW FAULT

DURING PURGE

1. Blower not running or running too slow

2. Defective Air Flow Switch

3. Blocked Air flow Switch

4. Blocked Blower inlet or inlet ductwork.

5. No voltage to switch from control box.

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 okay, check

the blower.

2. Start the unit. If the blower runs, check the airflow switch for

continuity. Replace the switch if there is no continuity.

3. Remove the air flow 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. Measure for 24 VAC during start sequence from each side of the

switch to ground. If 24VAC is not present refer to qualified

service personnel.

AIRFLOW FAULT

DURING RUN

1. Blower stopped running due to thermal

or current overload

2. Blocked Blower inlet or inlet ductwork

3. Blocked airflow switch

4. Defective airflow switch

5. Combustion oscillations

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 airflow switch and inspect for signs of blockage,

clean or replace as necessary.

4. Measure the airflow switch for continuity with the combustion

blower running. If there is an erratic resistance reading or the

resistance reading is greater than zero ohms, replace the switch.

5. Run unit to full fire. If the unit rumbles or runs rough, perform

combustion calibration.

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Aerco KC Series Instruction Manual Page 58

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