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Code + Description | Cause | Solution | Remark |
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F03 (lock out error) | Damaged wiring/Open | 1. | Check the wiring between the pressure switch and the | If the error cannot be resolved or is persistent, contact your |
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| circuit |
| controller | installation engineer |
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The pressure switch |
| 2. | If necessary, replace the wiring | To replace the necessary parts, you must contact your installation |
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fails to work correctly |
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| Pressure switch not | 1. | Check the running speed of the fan (12.5 "Display the selected |
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| closing |
| appliance") |
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| 2. | Check that the hoses on the pressure switch and the air supply |
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| hose between fan and burner are correctly fitted. Refit them if |
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| necessary |
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| 3. | Check for cracks in the hoses on the pressure switch and in the |
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| air supply hose between fan and burner. If necessary, replace |
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| the hoses. |
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| 4. | Check that the flue gas outlet is compliant (3.9 "Air supply and |
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| flue"). |
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| 5. | Check for blockage in the flue gas discharge. Remove any |
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| blockage that may be present |
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| 6. | Check for blockage in the condensation water discharge. |
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| Remove any blockage that may be present. |
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| 7. | Measure the pressure differential across the pressure switch. |
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| See the table in Preparation for |
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| maintenance (15.2 "Preparation for maintenance"). If there is |
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| insufficient pressure differential, clean the heat exchanger. If the |
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| pressure differential is acceptable, check that the pressure |
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| switch is closing, using a multimeter. |
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Instruction manual BFC | 75 |
