Sleepstyle humidifer and heated tube troubleshooting

Your Fisher & Paykel SleepStyle humidifier and ThermoSmart™ heated breathing tube operate using an automatic algorithm. The heater plate and heated tube may not feel warm all the time, even when the humidifier is working correctly.

How the humidifier works

The SleepStyle continuously measures several conditions, including:

  • The selected humidity setting
  • Room temperature and humidity
  • Therapy pressure and airflow
  • Mask leak
  • Whether the mask is being worn

The system then automatically adjusts the heater plate to provide the required amount of humidity.

When the surrounding air is already warm or humid, the machine may need very little additional heat. At lower therapy pressures, airflow may also be lower, so less heater plate output may be required.

The heater plate will therefore only turn on when additional humidity is needed.

Why the heater plate may not feel warm

A cool or only slightly warm heater plate does not necessarily mean the humidifier is faulty.

The heater plate may produce little or no noticeable heat when:

  • The room humidity is already high.
  • The room temperature is relatively warm.
  • Your therapy pressure or airflow is low.
  • Your mask leak is very low.
  • The machine detects an unusually high leak or a mask-off condition.
  • The selected humidity level is low or set to 0.

If the reported 90th-percentile leak is below approximately 15 L/min, the heater plate may not need to activate. If the leak becomes extremely high, the machine may detect that the mask has been removed and switch off the heater plate.

Checks you can perform


1. Check the humidity setting

Make sure the humidity setting is above 0. Increase the setting by one level and assess the comfort over the next few nights.

Avoid increasing the setting too quickly, as excessive humidity can cause condensation or water to collect inside the tube.


2. Check the water chamber

Confirm that:

  • There is water in the chamber.
  • The chamber has been inserted fully into the machine.
  • The chamber is not cracked or leaking.
  • The chamber seal is clean and correctly positioned.

Use distilled or demineralised water where possible and do not fill above the maximum water line.


3. Check the ThermoSmart heated tube connection

Remove the tube from the machine and reconnect it firmly.

Make sure the electrical connectors align correctly and that the connection clicks securely into place. When the ThermoSmart tube is detected correctly, the ThermoSmart icon should appear normally on the SleepStyle home screen.  The Therosmart Icon is displayed below.



4. Check the ThermoSmart icon


If the ThermoSmart icon has a line through it, appears incomplete, or has a gap where the normal icon should appear:

  1. Stop therapy.
  2. Disconnect the breathing tube from the machine.
  3. Inspect the electrical contacts for moisture, dirt or damage.
  4. Allow any moisture to dry completely.
  5. Reconnect the tube firmly and restart the machine.

You will generally continue to receive therapy and humidification if there is a ThermoSmart connection issue, but heated-tube performance may not be optimal.

A standard, non-heated breathing tube will not display the ThermoSmart icon.

Is the humidifier working correctly?

Signs that the humidifier is operating normally include:

  • The water level gradually decreases overnight.
  • Your mouth and nasal passages feel less dry.
  • The machine does not display a humidifier or heated-tube error.
  • The ThermoSmart icon appears normally when the heated tube is connected.

Water consumption varies considerably depending on room conditions, therapy pressure, mask leak and the selected humidity setting. Some nights may use very little water.



When to contact us

Please contact Easy CPAP if:

  • The water level never decreases despite using a higher humidity setting.
  • The machine displays a humidifier or ThermoSmart error.
  • The heated-tube icon remains crossed out after reconnecting the tube.
  • The water chamber, heater plate or electrical contacts appear damaged.
  • You continue to experience significant dryness or condensation after adjusting the settings.

When contacting us, please provide a photo of the machine’s home screen, the tube connection and the water chamber.

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