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APPENDIX C __________________________________________________
C1 TROUBLESHOOTING GUIDE FOR THE MR700 SERIES RESPIRATORY HUMIDIFIERS
This is a guide to possible corrective action in the case of an humidifier alarm condition or malfunction. It is primarily written for humidifiers using heated wire mode. So parts of this guide would not be applicable for the MR480 and MR730 and MR720 in the heater wire off mode.
Unless the cause and immediate effects of an alarm condition are understood and assessed to be of no hazard to the patient, the humidifier should be immediately switched off and removed from the patient circuit.
C1.1 LOW TEMPERATURE
Condition detected | Possible cause | F Action to take |
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Temperature less than desired, | Humidifier warming up. | Wait for a few minutes. |
no alarm. |
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| Standby mode switched on. | Push mode button for 1 second to |
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| disable standby. Wait 20 minutes (30 |
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| minutes for v3.0 software). |
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| Temperature probe not in position. | Check position of temperature probe in |
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| the circuit. |
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Airway temperature low alarm | Gas flow stopped or interrupted. | Enter standby mode or turn humidifier |
activated. |
| off until gas flow resumed. (Gas flow |
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| must be resumed before coming out of |
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| standby mode). |
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| Set temperature increased by more than | Wait for temperature to rise. |
| 2 °C. |
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| Temperature probe not in probe | Fit temperature probe. |
| housing. |
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| Gas flow rate too low. | Increase gas flow to more than 2 litres |
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| per minute. |
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| Too much distance between end of | Use longer heater wire or shorten |
| heater wire and temperature probe. | inspiratory hose so that distance is |
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| between 25 (1") and 100 mm (4"), ideally |
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| 30 mm. |
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Chamber temperature low alarm | Poor thermal contact between base of | Check that chamber base and heaterplate |
activated. | chamber and heaterplate. | are clean, smooth and flat. If necessary |
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| clean or replace. Humidification |
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| chambers which are not manufactured by |
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| Fisher & Paykel may not be suitable. |
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| Temperature probe not inserted at | Fit temperature probe correctly. |
| chamber outlet. |
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| Heater element needs replacement. | Send for repair. |
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| Gas flow rate too high for chamber | Use correct chamber. Refer to the |
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| operating instructions for the type of |
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| chamber used. |
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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
