Hi, I have a Vitodens 050 W (24kW) used in an apartment floor heating system. Lately I keep getting the A9 error. I've reset the boiler and I've changed the batteries in the wired wall thermostat (Honeywell CM707) but the error randomly appear. There is also a mechanical thermostat mounted on the floor distribution heating system, wired connected in boiler. The system settings are as follows: 45*C set on primary heating circuit in boiler control panel, 24*C set on the wall wired thermostat, 40*C set on mechanical thermostat mounted on the floor distribution heating system. As far as I've read, A9 error in Vitodens 050 W could be related to the thermostat connections but the wires are fine, no changes on this side. Would you please advise, is there anything else that I can check or change? Also, the optimal functional regime will be using the higher temperature setpoint set on the boiler primary heating circuit or on the mechanical thermostat mounted on the floor heating distribution system? Thank you,
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