ResMed CPAP Humidifier Not Working: HumidAir Troubleshooting

Quick Answer

The ResMed HumidAir humidifier on AirSense 10 and 11 devices stops working most often because the gold electrical contact pins between the water chamber and the device base become corroded or coated with mineral deposits from non-distilled water. Cleaning these pins with isopropyl alcohol on a cotton swab resolves the issue in roughly half of cases. The second most common cause is a cracked or warped water chamber that does not seat fully, breaking the electrical connection. If cleaning the contacts and reseating the chamber does not restore heating, the heating plate inside the chamber or the device-side heating circuit may have failed, requiring a new water chamber ($25-40) or DME service respectively.

ResmedCpapSeverity: medium75% DIY Success

Time to Fix

5–20 min

Difficulty

beginner

Parts Cost

$0 – $0

Tools Needed

Isopropyl alcohol wipes, Cotton swabs

What Does the HUMID-FAULT Code Mean?

Your ResMed humidifier is most likely not working due to dirty contact pins. Clean the gold pins on the water chamber and device base with isopropyl alcohol, then reseat the chamber firmly.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Gold contact pins corroded or dirty40%

Water chamber not fully seated24%

Mineral buildup from tap water on contacts14%

Heating plate inside chamber failed12%

Water chamber cracked or warped from dishwasher use10%

Symptoms You May Notice

Air feels dry and cold at the mask
Water chamber water is still cold after running therapy
No steam or moisture visible in tubing
Dry nose, throat, or mouth after therapy
Humidity icon not showing on device display

Can you reset a Resmed cpap to clear the HUMID-FAULT code?

AirSense 10: Settings > Device > Reset Device restores Climate Control to Auto mode defaults. AirSense 11: My Device > Factory Reset. A reset can resolve software glitches where the device stops recognizing the humidifier, but will not fix corroded contacts or failed heating hardware.

Tools Required for Diagnosis

Isopropyl alcohol wipesCotton swabsDistilled waterSoft dry cloth

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Check Climate Control settings

Check Climate Control settings. On AirSense 10, navigate to Settings > Climate Control and ensure it is set to Auto or Manual with humidity level above 0. On AirSense 11, check My Comfort > Humidity. If set to Off, turn it on and select your preferred level.

Remove the HumidAir water chamber by sliding it out from the

Inspect the water chamber for cracks

Start therapy and let the device run for 15 minutes

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
ResMed HumidAir Water ChamberN/A · $0–$0	N/A	$0 – $0
ResMed HumidAir Water Chamber Seal GasketN/A · $0–$0	N/A	$0 – $0

Verify part fitment for your Resmed model

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs

Labor Approach

Our Verdict

REPLACE

Estimated Cost: $0 (Parts) vs $800 (New Machine)

Frequently Asked Questions

Can I use tap water in my ResMed humidifier?

ResMed recommends distilled water only. Tap water contains minerals that deposit on the heating plate and contact pins over time, reducing heating efficiency and eventually causing connection failures. If you must use tap water temporarily, clean the chamber daily and switch to distilled as soon as possible.

Can I run my CPAP without the humidifier?

Yes. The AirSense 10 and 11 work without the HumidAir chamber installed. However, breathing dry pressurized air all night frequently causes nasal dryness, nosebleeds, sore throat, and congestion. If your humidifier needs replacement, use a standalone room humidifier as a temporary measure.

How do I clean the HumidAir water chamber?

Wash the chamber daily with warm water and mild dish soap. Rinse thoroughly and air dry. Do not put it in the dishwasher as the heat can warp the plastic. For mineral buildup, soak in a solution of 1 part white vinegar to 10 parts water for 30 minutes, then rinse. Replace the chamber every 6-12 months.

Related Resmed Cpap Error Codes

Code: HUBResMed CPAP Error Codes: Complete AirSense 10 and 11 Fault Guide Code: HUMID-ERRORResMed CPAP Humidifier Fault Code: HEAT-ERRORResMed CPAP Heating System Error Code: LEAK-WATERResMed CPAP Leaking Water: Causes and Fixes

Models Known to Experience HUMID-FAULT Errors

This repair applies to most Resmed cpaps with this error code. Common model numbers include:

AirSense 10 AutoSet, AirSense 10 CPAP, AirSense 10 Elite, AirSense 10 For Her, AirSense 11 AutoSet, AirCurve 10 VAuto, AirCurve 10 ST

Last verified for technical accuracy on March 15, 2026