ResMed CPAP Error 24: Climate Control Fault on AirSense 10

Quick Answer

ResMed CPAP Error 24 indicates a climate control fault where the device cannot regulate the temperature of the humidifier or heated tube. The primary fix is to disconnect the power, reseat the HumidAir water tub and ClimateLine hose, then restart the machine.

This fault usually hits you right in the middle of the night when your AirSense detects something's off with the heating circuit. I see this constantly, and honestly nine times out of ten it's just a tub that isn't fully seated or some moisture on the dock pins. Ignore it long enough and you'll end up sleeping without any humidification, which makes for a rough night and a seriously dry throat by morning.

ResmedCpapSeverity: moderate65% DIY Success

Time to Fix

5–20 min

Difficulty

beginner

Parts Cost

$25 – $55

Tools Needed

Soft dry microfiber cloth (for wiping dock and chamber contacts), Canned air (for blowing out ClimateLine connector pins)

What Does the 24 Code Mean?

So basically, this is a communication breakdown between the AirSense's brain and the heater plate. ResMed built these sensors to be really sensitive because overheating is a genuine safety risk. I replaced three of these HumidAir chambers just last Tuesday, and most times it wasn't even the chamber that was bad, it was moisture on the ClimateLine pins or a slightly crooked tub. It's the machine failing safe before anything gets too hot.

Most Likely Causes

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

HumidAir water chamber not seated fully in its dock40%

Empty water chamber with climate control mode enabled24%

ClimateLine heated tube connection loose or damaged14%

Temperature sensor on chamber dock faulty12%

HumidAir heating plate element failure10%

Symptoms You May Notice

Error 24 flashes on screen either right when you press start or sometime in the middle of the night when the temperature sensor fails under load
The ClimateLine tube feels stone cold against your skin even after an hour of therapy
You wake up with a desert-dry mouth and throat even though the chamber had water in it when you went to sleep
Water level in the chamber looks exactly the same as last night, meaning the humidifier ran all night but never actually heated anything
Machine starts and runs fine but the climate control icon is missing from the display or shows as inactive

Can you reset a Resmed cpap to clear the 24 code?

Unplug the power brick from both the machine and the wall. Pull the water tub out completely. Wait a full 60 seconds, not just 10. While you're waiting, wipe the contacts on the tub and inside the dock with a dry cloth. Reseat the tub until you hear a click. Plug the power into the wall first, then into the machine. Watch the startup screen. If the code doesn't come back in the first 30 seconds, you're probably in the clear.

Tools Required for Diagnosis

Soft dry microfiber cloth (for wiping dock and chamber contacts)Canned air (for blowing out ClimateLine connector pins)Distilled water (for refilling the humidifier chamber)Standard short CPAP tube (for diagnostic testing without ClimateLine)

Diagnostic Checklist

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

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 chamber (standard or travel, fits AirSense 10)N/A · $25–$45	N/A	$25 – $45
ResMed ClimateLine heated tube (if tube is damaged)N/A · $35–$55	N/A	$35 – $55

Frequently Asked Questions

Can I still use my CPAP if it shows Error 24?

You can, but you'll need to tell the machine to stop trying to heat the water. Go into your settings and turn the humidifier and heated tube to Off. The machine will then act like a basic CPAP without the climate features, which bypasses that faulty sensor check so you can sleep through the night. Just know the air's gonna feel way cooler and drier than you're used to. Most people can handle a night or two of it while they wait for a replacement part to arrive.

Why does ResMed recommend distilled water for the humidifier?

It's not just about cleanliness. Tap water minerals, mostly calcium and magnesium, build up a white crusty layer on the heater plate. That crust acts like insulation and forces the heating element to work way harder to hit the target temperature. Eventually the element overheats or the sensor reads something out of range and you get Error 24. Distilled water keeps the plate clean and the heat transfer efficient, and honestly it just makes the whole chamber last a lot longer too.

Is the HumidAir water chamber covered under the AirSense 10 warranty?

The chamber itself is usually considered a consumable by ResMed, so it's not warrantied the same way the machine is. But the heating dock built into the machine body is covered under the standard 2-year warranty. If you've tried a brand new HumidAir tub and a new ClimateLine hose and still can't shake the error, the problem's almost certainly in the machine's internal wiring or sensor. Call your DME provider and they'll walk you through a warranty exchange. Fair warning though, they'll check for water damage first because that usually voids coverage.

How do I know if my ClimateLine tube is the problem or the water chamber?

Easiest way to figure this out is to disconnect the ClimateLine and plug in a standard short CPAP tube instead. If the error disappears with the regular tube, your ClimateLine is the culprit. If it's still there even with the plain tube, the problem's in the dock or the machine itself. A new ClimateLine runs about $60 for the genuine ResMed version. Don't bother with cheap knockoffs. I've seen patients come back with counterfeit ClimateLine tubes that triggered this exact error because the thermistor specs were slightly off from ResMed's tolerances.

How often should I replace the HumidAir water chamber?

ResMed officially says every 6 months, and honestly that tracks with what I see. After 6 months of daily use and weekly washes, those gold contacts on the back of the tub start to oxidize and the plastic can develop tiny cracks that let moisture into the connector area. I've seen plenty of people stretch them to a year and then wonder why they're suddenly getting Error 24 on a machine that's been working fine forever. A new genuine HumidAir chamber runs $25 to $35. Cheap insurance compared to fighting your equipment at 2am.

Related Resmed Cpap Error Codes

Code: HUBResMed CPAP Error Codes: Complete AirSense 10 and 11 Fault Guide Code: HUMIDIFIERResMed CPAP Humidifier Not Working: Fix HumidAir on AirSense 10 Code: HUMIDIFIER-FAULTResMed CPAP Humidifier Fault: AirSense 10 HumidAir Error Fix Code: HEAT-ERRORResMed CPAP Heating System Error: Fix ClimateLine Fault

Models Known to Experience 24 Errors

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

AirSense 10 AutoSet, AirSense 10 AutoSet for Her, AirSense 10 CPAP, AirSense 10 Elite, AirSense 11 AutoSet, AirCurve 10 VAuto, AirCurve 10 S, AirCurve 10 ST

Written by

Sarah Kim

Smart Home & Specialty Appliance Tech · 12 years experience

Last verified for technical accuracy on March 15, 2026