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Bosch Greenstar 151 Condensing Boiler not maintaining set temperature
This system was installed in May 2014 and since the weather has turned extremely cold, my downstairs zone will not maintain the temperature set on livingroom thermostat... upstairs is fine.. it it does finally reach the set temp which is generally set to 70 degrees, ... during this frigid weather... temp falls during the night and upon waking will be at times, well below 70. sometimes as low as 63 degrees!... BRRRR! Installers telling me that its the house which is 25 years old... saying poor insulation,,, windows,,, placement of baseboards... etc...I never had issues before when I had an oil system and it is my belief that it is none of thos things and should maintain the heat even if it has to run all day.. they claim the settings are correct... In doing some research... I discovered that the outdoor reset sensor is placed in the wrong area...from what I have read in the manual... it should not be on the south side of the house or near anything that sould influence the temp such as the boiler exhaust pipe... would the placement of the outdoor reset possibly affect the issue I am having?