Resmed CPAP Error 004 Error Code
Quick answer
This error message refers to the main PC board being over temperature. This is typically corrected by unplugging your CPAP machine and allowing it to cool down. If you continue to have this error message, then it will need to come in for service
Severity: high · DIY difficulty: intermediate
Safety
TBD - must be written per-code before publish
What Error 004 means
This error message refers to the main PC board being over temperature. This is typically corrected by unplugging your CPAP machine and allowing it to cool down. If you continue to have this error message, then it will need to come in for service
Code meaning varies by series
- AirSense 10 - Altra Service Professionals field reference (authorized ResMed service center): This error message refers to the main PC board being over temperature. This is typically corrected by unplugging your CPAP machine and allowing it to cool down. If you continue to have this error message, then it will need to come in for service
- AirSense 10 - ResMed official user guide: Device may have been left in a hot environment (allow to cool), air filter may be blocked (replace filter), or water may be in the air tubing. Disconnect then reconnect the power supply to restart the device.
Causes, ranked
Causes not yet documented — verify against the service manual.
Parts & supplies for Resmed CPAP: filters, control boards, sensors, and common replacement parts.
Sources
- Altra Service Professionals (ResMed authorized service center) - ResMed AirSense 10 problems and numbered error-code field reference (Error 001-020) — verified 2026-08-29
- ResMed AirSense 10 device with humidifier - User Guide (Americas, official): Error 004 = hot environment/blocked filter/water in tubing - cool, replace filter, power-cycle; all other Error 0XX = unrecoverable device fault, contact care provider, do not open — verified 2026-08-29