A.O. Smith BPD-80 Series Installation And Operating Manual page 57

Corrective
Action
Number
1. Gas supply is turned off or gas pressure is too low. Ensure supply pressure and manifold gas
pressures are within requirements. Manifold pressure is nonadjustable, if gas supply pressure
proves correct and manifold pressure is off by more than 0.3" WC replace the control.
2. Low supply voltage - should be 115 - 125 VAC
3. Ensure flame sensor is making good contact with the burner flame and flame is steady.
4. Ensure flame sensor is clean, use ultra- fine steel wool to clean flame sensor.
8
5. Ensure the Hot Surface Igniter is positioned properly to provide consistent ignition.
6. Check for any cracks in igniter assembly ceramic insulators - replace igniter assembly if damaged.
7. Check resistance of igniter at room temperature (at the plug). Replace the igniter if resistance is
not within 42-76 ohms at room temperature.
8. Ensure correct size of exhaust and air intake pipes were used per the instruction manual for vent
length. Ensure maximum number of elbows or equivalent feet of both pipes was not exceeded.
1. Ensure the blower is running - check for 120 VAC to the blower when the heating cycle begins.
a. If the Gas Control does not energize the blower - replace the Gas Control.
b. If the blower fails to start when energized:
i. Turn power to the unit "OFF" – check if the capacitor is connected;
ii. Turn power to the unit "OFF" – check the capacitor rating ( 3uF +/-5%);
iii. Turn power to the unit "OFF" - replace the blower assembly.
2. Ensure the air pressure sensing tubes are properly connected and not kinked or damaged;
3. Check continuity of the vent temperature limit switch – replace switch if contacts remain open.
4. Check continuity of the air pressure switch (N.C.) – replace switch if contacts remain open.
9
5. Ensure correct size of exhaust and air intake pipes were used per the instruction manual for vent
length. Ensure maximum number of elbows or equivalent feet of both pipes was not exceeded.
6. Ensure there are no obstructions in the exhaust and air intake pipes.
7. If there are excessive restrictions in the air intake pipe the air pressure switch (N.C.) will open.
8. Check air pressure switch performance - Check blower vacuum with a manometer - Compare
with air pressure switch (N.O.) setting. If the air pressure switch proves defective – replace the air
pressure switch (N.O.).
9. If the air pressure switch (N.O.) performance test results prove the air pressure switch is working
properly, and all other steps are followed, and fault code persist – replace the control.
1. Gas supply is turned "OFF" or gas pressure is too low. Ensure supply pressure and manifold gas
pressures are within requirements. Manifold pressure is nonadjustable. If supply pressure proves
correct and manifold, pressure is off by more than 0.3" WC replace the control.
2. Low supply voltage - should be 115 - 125 VAC
3. Ensure flame sensor is making good contact with the burner flame and flame is steady.
4. Ensure the flame sensor is clean, use ultra-fine steel wool to clean flame sensor.
10
5. Ensure the Hot Surface Igniter is positioned properly to provide consistent ignition.
6. Check for any cracks in igniter assembly ceramic insulators - replace igniter assembly if damaged.
7. Check resistance of igniter at room temperature (at the plug). Replace the igniter if resistance is
not within 42-76 ohms at room temperature.
8. Ensure correct size of exhaust and air intake pipes were used per the instruction manual for vent
length. Ensure maximum number of elbows or equivalent feet of both pipes was not exceeded.
1. Turn the power "OFF" for 10-20 seconds then "ON" again to clear the fault code.
11
2. Replace the control if fault code persists.
12 N/A – If this happens replace the gas control.
13 N/A – If this happens replace the gas control.
1. Turn the power "OFF" for 10-20 seconds then "ON" again to clear the fault code.
14
2. Replace the control if the fault code persist.
1. Turn the power "OFF" for 10-20 seconds then "ON" again to clear the fault code.
15
2. Replace the control if the fault code persist.
1. Turn the power "OFF" for 10-20 seconds then "ON" again to clear the fault code.
16
2. Replace the control if the fault code persist.
17 1. Control has failed. If resetting the control does not clear the fault code, replace the control.
100299634_2000545244_ Rev. A
Corrective Action
57