Daikin Altherma
11 fault codes documented
Blinking blue LED — Unit is in standby mode
The blue LED on the status indicator is blinking. This means the unit is currently in standby and not actively operating.
Blinking red LED — An error has occurred
The status indicator LED is blinking red, signaling that the unit has encountered an error. You can view a short and a long description of the error on the unit's display.
Solid blue LED — Unit is operating
The status indicator light on your Daikin Altherma 3 H HT W is constantly lit blue. This signifies that the unit is currently active and performing its heating or cooling operation.
Blue pulsation LED — Unit is in standby
The status indicator on your Daikin Altherma 3 H HT W shows a blue light pulsing every 5 seconds. This indicates the unit is currently not operating but is in standby mode, ready for use.
Continuous blue LED — Unit is operating
The blue LED on the status indicator is solid. This indicates that the unit is currently active and performing its heating or cooling function.
'Emergency' displayed — Heat pump failure or forced off
The unit is operating in 'Emergency' mode because the heat pump has failed or been forced off. Depending on settings, space heating might be reduced, and domestic hot water may not be available.
Error or Malfunction on display — See error details
The home screen shows 'Error' or 'Malfunction' depending on the issue's severity. This indicates a problem with the system that needs attention. You can get more information from the unit's menu.
Feeling too cold — Temperature setting or schedule issue
Your living space is not reaching the desired temperature. This could be due to incorrect temperature settings or programmed schedules.
Feeling too hot — Temperature setting or schedule issue
Your living space is too warm. This may be because the target temperature is set too high or the heating schedule needs adjustment.
Gurgling noises after starting — Air in the system
The system is making gurgling sounds, which usually means there is air trapped within the heating system. This can affect performance.
Heat pump failure symbol — System in Emergency mode
The symbol 'c' on the display indicates that the heat pump has failed and the system is operating in Emergency mode. Domestic hot water or heating might be reduced or unavailable.