Buderus boiler ignores set temperature and setbcack mode

Atmonaut

Hello all,

I am a new member here and while I have been reading topics for the last couple of weeks trying to figure out my issue, I have not managed to do so. Hence I am creating my own topic trying to see if anyone can help or has experienced something similar.

Summary of my setup:

• Buderus Logamax Plus GB162-15
• RC35 thermostat installed in the living room
• EMS-ESP installed in the service port for monitoring/remote access (and integration with Home assistant)
• One unmixed Heating Circuit with radiators
• Domestic hot water (3way valve charging)

Description of the problem:

Even if I set the heating operating mode in "night mode" (shut-down setback mode selected in settings) the burner keeps on firing every 10 minutes. If I have any radiator valve in the living room then the temperature keeps on rising way above the setpoint even for day mode. if I close all radiators manually then the boiler keeps on running every 10 minutes only briefly to raise a bit the flow temp. It seems night/day mode is ignored, and even if I have the rotating dial on the boiler set to "Aut", the boiler tries to always bring the temperature to 90C.

This is how the system behaves when all radiators are shut:

This is how it looks with the living room radiators open:

I attach a few screenshots of the settings on the boiler and the thermostat.

Thermostat Settings and Sensors 4.png

Thermostat Settings and Sensors 3.png

Thermostat Settings and Sensors 2.png

Thermostat Settings and Sensors 1.png

Boiler Settings and Sensors 4.png

Boiler Settings and Sensors 3.png

Boiler Settings and Sensors 2.png

Boiler Settings and Sensors 1.png

Any help or input will be greatly appreciated!

DownieC

Our Buderus boiler does this when it’s in manual/ override mode. There’s a rocker switch on the front of the Logamatic (it has a hand on it for manual) that needs to be on automatic to switch out of the manual/override mode. It’s confusing because the boiler can be in manual/ override mode even if “automatic” is displayed on the screen. We don’t have the same model as you but maybe you are in manual/ override mode?