Daikin Troubleshooting guide

Common Error Codes

7H – Filter or Low Water Pressure

This usually indicates a flow issue, such as a blocked filter or insufficient water pressure in the system.

If the error persists, please contact us for further checks.

AH – Hot Water Disinfection Not Completed

Short explanation:

The heat pump didn’t finish its hot water disinfection cycle. This is usually nothing to worry about. Leave the system running as normal — it should retry the cycle within a week and clear the warning automatically.

If the error is still showing after 7 days, please contact us.

More detail:

Once a week, your hot water cylinder runs a disinfection (pasteurisation) cycle, usually overnight when hot water demand is low.

If hot water is used during this time (for example, someone runs a bath), the cycle stops and the system records a warning. This remains visible until the next successful cycle.

Missing one week will not cause any issues.

Helpful Videos

How to set a hot water schedule on a Daikin system:

https://www.youtube.com/watch?v=ptq0BR7-sNQ

Using the Daikin Madoka controller

(Only applicable to a small number of installations)

https://www.youtube.com/watch?v=tOKkS1I4REE

Contacting Daikin Support

If you need direct assistance from the manufacturer, you can contact Daikin Homeowner Support on 01932 879279.

You can also find information on servicing and maintenance packages here:

https://www.daikin.co.uk/en_gb/residential/services/maintenance/maintenance-packages.html