Troubleshooting

If there is a problem, try the following suggestions. If the problem cannot be solved, contact your equipment supplier or ResMed. Do not open the unit.

WARNING

!Service and repair should only be performed by an authorized service agent.

Problem	Possible Cause	Solution

Device not working	Power cord is not plugged in
(no display on LCD	properly.
screen and/or
indicator light not
lighting up)	Faulty power outlet.
	Flow generator and docking station
	not connected correctly.

Check that the power cord is plugged firmly into the power outlet and the switch (if available) is on at the outlet.

Try another power outlet.

Check that the docking station is securely attached to the flow generator.

Indicator light is	H4i reflector is dirty.
permanently dull and/
or air does not feel
warm

Clean the reflector with a damp cloth.

Leaking water	The water chamber may be
chamber	damaged or cracked.

Contact your supplier for a replacement.

No/low air flow	The air tubing is not connected
	properly.
	The air tubing is blocked, pinched
	or punctured.
	The flow generator is not working
	correctly.
	The cover is not latched correctly.
	The cover seal is not fitted
	correctly.

Connect the air tubing as described in “Setting up your H4i for use” on page 1.

Unblock or free the air tubing. Check the air tubing for punctures.

See the Troubleshooting section in the flow generator manual.

Make sure the cover is latched onto the docking station correctly.

Make sure the cover seal is facing the right way up and fitted securely.

Water splashing on	The water chamber is overfilled.	Empty some water from the water chamber.
your face
	Condensation is forming in the air	Turn the control dial down.
	tube and mask.
		Use the ResMed Tubing Wrap.