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A couple of months ago I had a Vaillant ecotec plus 831 combo boiler installed with a Vaillant VRT 350f programmable wireless room thermostat. Everything seemed to work OK on installation. The hot water works really well without any problems. With the rather colder weather recently, I have started to use the heating properly for the first time. When the room stat asks for heat, the boiler appears to go through the following sequence: (1) pump starts (2) burner fires and shows maximum on the left hand graphical display for a second or two, but then (3) drops to a low value and stays there. The flow temperature creeps up very slowly to the target value which I set to 65 degrees. Because the burner stays low, the radiators take ages to get up to 65 degrees. I should also mention that I have set the desired temperature on the controller several degrees above the room temperature to make sure this isn't having an influence.
I would have expected the burner to remain on full (or at a reasonably high level) and only modulate when the flow temperature approaches the target value. Installer can't come out for a few days. I would be very grateful if anybody with experience of this boiler/controller combination can suggest what the problem might be.
I would have expected the burner to remain on full (or at a reasonably high level) and only modulate when the flow temperature approaches the target value. Installer can't come out for a few days. I would be very grateful if anybody with experience of this boiler/controller combination can suggest what the problem might be.
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