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| 52 |
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| Excessive water in expiratory | Condensation due to cooling in | Use dual heated circuit. |
| circuit due to rainout. | Expiratory line. |
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| Water ejected from | Humidification chamber filled beyond | Rduce water level |
| humidification chamber into | maximum water level line. |
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| circuit. |
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| Maximum permissible peak flow rate of | Ue correct chamber. Refer to the |
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| humidification chamber has been | operating instructions for the type of |
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| exceeded. | chamber used. |
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| Humidifier chamber tilted. | Chamber should be level. |
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C1.5 | LOW HUMIDITY |
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| Condition detected | Possible cause | FAction to take |
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| Low humidity. | Chamber control set to low. | Increase setting. |
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| No water in humidification chamber. | Fill chamber. |
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| Chamber temperature low. | Check heaterplate temperature setting on |
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| diaplay when humidifier is switched on, |
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| Chamber base and heaterplate are smooth |
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| and flat and in good contact. (Chambers |
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| not made by Fisher & Paykel may not be |
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| suitable). |
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| Gas flow rate too high for chamber. | Check maximum flow rate in to chamber |
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| operating instructions. |
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C1.6 | ALARMS |
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| Condition detected | Possible cause | FAction to take |
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| Temperature probe alarm | Temperature probe unplugged. | Check connetion. |
| appears on display). |
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| Temperature probe plug dirty. | Clean plug. |
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| Temperature probe faulty | Replace probe. |
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| Heater wire alarm while | Heater wire unplugged. | Check connection. |
| temperature still displayed. |
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| Heater wire broken. | Replace heater wire. |
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| Heater wire switch turned off but | Turn heater wire on. |
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| heater wire connected. |
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| Heater wire switch turned on but heater | Turn heater wire off. |
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| wire not connected. |
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| Heater wire alarm while ‘F2’ | Internal fuse blown. | Send for repair. |
| displayed. |
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| 41 °C Overheat calibration outside | Check calibration of the 41 °C |
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| limits. | comparator. |
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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
