Error 1100
ResMed CPAP Machine
Severity: CriticalWhat it means
Error 1100 means the internal pressure sensor has failed or is reading incorrectly.
The machine cannot safely deliver therapy without accurate pressure sensing.
This is a hardware fault requiring service or replacement.
Affected Models
- ResMed AirSense 10 AutoSet
- ResMed AirSense 10 Elite
- ResMed AirSense 11 AutoSet
- ResMed AirCurve 10 VAuto
- ResMed S9 AutoSet
Common Causes
- Pressure sensor component failure
- Internal condensation damaging sensor circuitry
- Electronic board fault
- Dropping or physical impact damaging the sensor
How to Fix It
-
Unplug and leave unpowered for 5 minutes.
Occasionally a sensor gives a false error after a power fluctuation.
A full power cycle clears transient faults. -
Ensure the machine and humidifier chamber are dry.
If you use a heated humidifier, water can condense inside the machine in cold rooms.
Leave the machine unpowered with the humidifier removed for several hours. -
If Error 1100 returns, contact ResMed support.
Quote Error 1100 and your machine's serial number.
ResMed support: resmed.com/support -
Do not use a machine showing persistent Error 1100.
Without accurate pressure sensing, the machine cannot guarantee correct therapy pressure.
Using it could mean under-treatment of your sleep apnea.
Frequently Asked Questions
Will ResMed replace my machine for Error 1100?
If you are within the 2-year warranty period, yes — ResMed will repair or replace the machine.
If out of warranty, they may offer a refurbished unit at reduced cost.
Always contact them before buying a new machine.