AL Ken

Hi DillSue No I do not have an external thermostat so I do not understand why this choice is enabled but when you select it the choices are 1 contact or 2 contacts. The 2 contacts is selected (blue) but cannot be changed. In the Installer sensor section I have External Thermostat set to None so I do not understand why the Thermostat is shown (Note on the other nearly identical Altehrma system which is a bit newer the Thermostat choice is greyed out).

Hi JohnMo The system passes the flow rate test with 22 lpm and I have run repeatedly the air purge cycle. So there is enough water flowing but the compressor refuses to start. I attach more photos in case someone sees a screwup. Best Regards, AlKen

We have 2 Altherma systems, the first (11kW) has been running for 3 years driving UFH perfectly well with over 20,000 hrs of operation. Recently I added another circuit and had to repeat the air purge and flow commissioning tests which passed successfully. The problem is shown in the 2 photos attached where the system just sits there (12 hours) without starting the compressor. The settings are the same as they were before I added the extra circuit (setpoint fixed). In order to test the system I turned off the new circuit I added. The initial flow is 22.1 LPM but drops to the 11 LPM as shown in the photo after a while without the compressor ever starting. The 2nd Altherma is running perfectly with the same settings. I have compared all the settings by exporting them and comparing the .INI files but cannot see any differences. I am happy to share this setting file (.INI file) if there is a Daikin specialist capable of looking at it and spotting the issue. Can anyone advise where I should target my efforts please?