ResMed VPAP III, VPAP III ST, VPAP III ST-A Service Manual page 62

Symptom
Flow generator with humidifier
attached continues to restart
Error message:
Check hoses!!
Key if done
Error message:
System error! Call Service
(during normal operation)
VPAP III ST-A only: Message
"PRESSURE ERROR!" displayed
VPAP III ST-A only: Message
"IPAP LOWER ALARM"
displayed
VPAP III ST-A only: Message
"SENSOR ERROR!" displayed
VPAP III ST-A only: Message
"HIGH LEAK!!!" displayed
VPAP III ST-A only: Message
"LOW PRES ALARM" displayed
VPAP III ST-A only: Message
"HIGH PRES ALARM" displayed
VPAP III ST-A only: Message
"LOW MV ALARM" displayed
VPAP III ST-A only: Message
"NVENT ALARM" displayed
Possible Cause
• Humidifier not attached
correctly
• Pressure sensor adaptor is not
connected properly to flow
generator
• Damage to internal air tubing
• Pressure sensor adaptor or
external hose is damaged
• Transducer error
• Treatment pressure delivered
above 40 cm H 2 O
• VPAP III ST-A is operating
outside device specifications
(based on pressure support
and breath rate)
• Device motor speed, pressure
and flow sensors out of range
• High mask leak (greater than
40 L/min) for more than 20
seconds
• Air pressure at mask has fallen
below set level
• Mask is removed and
SmartStop has been disabled
• Mask pressure exceeds the
alarm setting for more than 700
milliseconds
• Measured level drops below
set limit for 30 seconds
• Mask leak is < 10 L/min
(indicating connection of non
vented mask) for at least 30
seconds
Solution
• Ensure humidifier is firmly
attached to flow generator
• Check and refit pressure
sensor adaptor as required
• Replace or repair as required
• Replace as required
• Replace Main PCB
• Replace blower assembly
• Replace Main PCB
• IPAP is automatically reduced
until the operation is back
within specifications. If breath
rate decreases, IPAP will
return to its previous value.
• Replace Main PCB
• Replace blower assembly
• Check and refit tubing as
required
• Check mask fit
• Check and refit tubing as
required.
• Turn flow generator off and on
again at the power switch
• Replace Main PCB
• Replace blower assembly
• Reduce CPAP or IPAP setting
• Consult clinician
• Use vented mask
• Disable non-vented mask
alarm if oxygen is being
entrained into patient circuit
8 Troubleshooting guide 61