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Code + Description | Cause | Solution | Remark |
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F04 (lock out error) | No gas | 1. | Open the main gas valve and/or the manual gas valve supplying | To repair the gas supply, contact your installation engineer |
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Three unsuccessful |
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| the water heater |
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| 2. | Check the supply pressure to the gas control |
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ignition attempts. |
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| 3. | If necessary, repair the gas supply |
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| Air in the gas pipes | Bleed the air out of the gas pipe | See Checking the supply pressure and burner pressure for how to |
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| bleed air from the gas line, and measure the supply pressure and |
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| No burner pressure | 1. | Check the burner pressure to the gas control |
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| burner pressure. |
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| 2. | Check that the gas valve(s) open and shut correctly |
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| To replace the necessary parts, you must contact your installation |
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| 3. | If necessary, replace the gas control. | engineer |
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| Defect in the hot | 1. | Check that the hot surface igniter is correctly connected (JP2). | If the error persists, contact your installation engineer. |
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| surface igniter circuit | 2. | Check the wiring of the hot surface igniter. | To replace the necessary parts, you must contact your installation |
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| engineer |
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| 3. | Measure the resistance across the hot surface igniter. This must |
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| lie between 2 and 5 ohms. |
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| 4. | Check that the hot surface igniter lights up during ignition. |
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| 5. | If necessary, replace the hot surface igniter. |
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| Defect in the ionisation | 1. | Check that the flame probe is correctly connected (JP2) |
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| circuit | 2. | Check the wiring of the flame probe |
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| 3. | Measure the ionisation current. This must be at least 1.5 |
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| microamps. |
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| 4. | Replace the wiring if necessary. |
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| Supply voltage too low | Check the supply voltage, this must be 230 VAC |
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F05 (lock out error) | Incorrect roof or wall | 1. | Check that the correct roof or wall flue conduit (3.9 "Air supply | If the error cannot be resolved or is persistent, contact your |
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| and flue") has been fitted. | installation engineer |
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Too many flame errors | Recirculating flue | 2. | If necessary, install the correct roof or wall conduit. |
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have been signalled. | gases. |
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3. | Check that the roof or wall conduit discharges into a permitted |
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Instruction manual SGE | 85 |
