ResMed High Temperature Fault: What It Means & What to Do
Quick answer
ResMed S9 documentation associates High temperature fault with a device left in a hot environment or a blocked external air filter. Allow the device to cool, inspect the external filter and tubing, disconnect and reconnect power once as the guide directs, and contact the provider if the fault persists.
Equipment: CPAP · Fault type: display message · Severity: high
What High Temperature Fault means
For the cited S9 device family, High temperature fault indicates a temperature condition that requires the device to cool before reuse. The exact message and model must be checked against the device's own user guide.
Safe exterior checks
Move the device away from a heat source, allow it to cool, inspect the external filter and tubing, and reconnect power once according to the matching guide. Do not open the enclosure or attempt internal cooling repair.
What you can safely check
- Stop therapy and read the complete displayed message before doing anything else.
- Disconnect power using the device power connector or power supply; do not open the enclosure.
- If overheating is implicated, move the device away from heat and allow it to cool before reuse.
- Inspect the external air filter for blockage and replace it only as the user guide directs.
- Inspect the air tubing for blockage, kinks, damage, or water.
- Where relevant, verify that the humidifier tub or side cover is seated correctly and dry.
- Reconnect power and perform ONE restart only when the manufacturer's user guide allows it for that message.
- If the fault returns, therapy is unavailable, or the message is unrecoverable, contact your CPAP equipment provider or authorized service center. Follow your care provider's guidance if therapy cannot be used.
What not to do
- Do not open the enclosure or replace internal electronics, blower hardware, sensors, or boards yourself.
- Do not perform calibration, enter undocumented service menus, bypass safety mechanisms, or change therapy-pressure settings to work around the fault.
Which models are covered?
- S9 AutoSet
- S9 Elite
- S9 VPAP families where the message is documented
If the message returns
Contact your CPAP equipment provider or authorized service center. If therapy is unavailable, follow the guidance from your care provider rather than improvising a replacement setting.
Related ResMed CPAP faults
Sources
- ResMed S9 AutoSet and S9 Elite — official user guide — manufacturer-support; verified 2026-09-03
- ResMed S9 Series H5i and air tubing information guide — official — manufacturer-support; verified 2026-09-03
Related CPAP guides
CPAP High Leak: What to Check · CPAP Machine Error: Safe Checks Before Calling Your Provider