Troubleshooting
Check procedure | Symptoms | Action / repair work | Further action / repair work |
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| 4.1 Machine is not working (no function) | YES - g) Check if electrical wires are functional | YES - Replace electronic mainboard |
| NO - Replace defective(s) wire(s) | ||
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4 Press On/Off button to perform | NO - Go to point 4.2 |
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automatic self test - continued | 4.2 Backlighted coffee button blinks at irregular | YES - Check if thermoblock heating element is func- | YES - Replace NTC |
| tional | NO - Replace thermoblock | |
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| NO - Self test ok. Go to point 5 |
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| YES - a) Water circuit is empty | YES - Fill water circuit (see page 9) |
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| NO - Go to point b) | |
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| YES - b) Flow meter is clogged | YES - Clean or replace it |
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| NO - Go to point c) | |
| 5.1 No coffee outlet |
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| YES - c) Pyramid plate is clogged | YES - Replace CBU | |
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5 Check coffee temperature while |
| NO - Go to point d) | |
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preparing a coffee (see page 30) |
| YES - d) Machine is blocked by scale | YES - Descale machine (see page 25) |
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| NO - Go to point 5.2 |
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| 5.2 Temperature is too low (less than 83°C) | YES - Descale the machine (see page 25) |
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| NO - Go to point 5.3 |
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| 5.3 Temperature is too high (more than 89°C) | YES - Change NTC |
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| NO - Go to point 6 |
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| 6.1 Leakage at extraction system | YES - Replace CBU |
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| NO - Go to point 6.2 |
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| 6.2 Leakage at tubes connection | YES - Replace defective tube and seal |
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6 Check for leaks and check flow | NO - Go to point 6.3 |
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rate (see pages 27, 28 and 29) |
| YES - Machine is scaled | YES - Descale machine (see page 25) |
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| NO - Replace pump | |
| 6.3 Flow rate out of range |
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| NO - No trouble found during the check procedure. | Contact Nespresso Technical Correspondant for | |
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7 Descaling process (if needed) | 7.1 Machine scaled | YES - Descale machine (see page 25) |
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NO - Go to point 8 |
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8 Final cleaning (see page 31) |
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| End of check procedure |
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Service Manual EF 473 / EF 474 | 16 | Version 1.0 en |