ATAG boiler giving C151 and not picking up the demand with Tado X
Hi, I am using tado x with ATAG E223 boiler from 2014.
Having underfloor heating downstairs and radiators upstairs. Have bypass installed and trying to keep only bedroom warmer in the night but the boiler cannot pick up the demand and temperature goes down with boiler giving C151 error.
I have tado x wired thermostat downstairs. It is set to on/off mode.
3 tado x radiator thermostats and 1 wireless tado x thermostat in bedroom.
It was working when I remove one tado knob upstairs and switched underfloor heating to manual.
Do you have any suggestions that I can implement or test? like adding an imaginary room etc?
Thanks in advance!
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