BT is overheating

[dieterpapa]

Hi all,

since several days my BT is overheating my house. I've combined 4 TRVs (Fritz 302) and the climate entity of my gas heater.
Room temperature is measured by an external Sonoff thermostate.
Even if room temperature is clearly above the preset temperature, BT keeps the temperature of the grouped climate entities above preset room temperature.

calibration mode of climate entities is "normal".
Any ideas?

Best regards

Dieter