USER GUIDE
Safety shutdown
If an operating error develops, the system locks and the display flashes: the first digit shows the sequence the burner was in when the error occurred, the last two digits show the error code (see table below); the first digit and the next two flash alternately.
To reset the system:
•Press the “RESET” button on the MCBA display.
•If an error occurs again, call an approved heating engineer.
Table of error codes and corrective action
codes | Error description | Fault repair | |
00 | No flame detected | - check wiring / - change electrode / - change MCBA | |
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02 | No ignition after 5 attempts | - check ignition electrode and its positioning | |
Internal error | - if the problem persists after 2 resets, change the MCBA | ||
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11 | Eprom error | - if the problem persists after 2 resets, change the MCBA | |
12 | Low water pressure or 24V fuse failure | - top up the primary circuit (see Using The Boiler - Heating System Pressure). | |
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| - call engineer to check fuse | |
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Internal error | - if the problem persists after 2 resets, change the MCBA | ||
18 | Primary temperature 1 > 110 °C | - check that sensor NTC1 is propely housed in its pocket | |
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| - if so, change sensor NTC1 | |
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19 | Primary temperature 2 > 110 °C | - check that sensor NTC2 is propely housed in its pocket | |
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| - if so, change sensor NTC2 | |
25 | Primary temperature 1 gradient too high | - check that the shunt pump is operating, and if so vent the boiler | |
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28 | No fan signal | - if the fan is turning: | |
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| • check the PWM connection |
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| • if the problem persists after 2 resets, change the fan |
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| • if the problem persists after 2 resets, change the MCBA |
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| - if the fan is not turning: | |
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| • check the 230 Volt power to the fan |
31 | Short circuit in temperature 1 sensor | - | change sensor NTC1 |
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32 | Short circuit in temperature 2 sensor | - | change sensor NTC2 |
33 | Hot water temperature sensor | - | change sensor NTC3 |
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36 | Temperature 1 sensor: circuit open | - check the connection of sensor NTC1 to the terminal strip | |
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| - if the problem persists, change sensor NTC1 | |
37 | Temperature 2 sensor: circuit open | - check the connection of sensor NTC2 to the terminal strip | |
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| - if the problem persists, change sensor NTC2 | |
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38 | Hot water temperature sensor: circuit open | - check the connection of sensor NTC3 to the terminal strip | |
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| - if the problem persists, change sensor NTC3 | |
44 | Internal error | - if the problem persists after 2 resets, change the MCBA | |
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