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1

We got an engineer in to deal with issues outside of the scope of the question, and Viessmann support would talk to him, they pointed out that it wasn't a test mode or crash, it was the LCD brightness! Hold down the OK button, and press the minus button (-) (not originally pictured, below the plus (+)) and turn down the brightness, fixed!


2

Air is dissolved in water, that's how fish and many other types of marine life live underwater. As water is heated it releases some of that air. (thanks for the advice, Ed)


2

First, if this is a forced hot-water system with baseboard heating, they're called convectors, not radiators. Bleeding the system is fairly simple (though a bit messy and time-consuming), and, as you diagnosed, the most likely fix. There should be an air bleeder, or purging, valve at the end of each baseboard unit and one in the basement by the boiler, ...


1

Retrofitting an air conditioning unit to work as a heat pump is impractical. It can be done, but I don't know of any instance where it has. A common configuration is using a gas furnace as back-up heat for a heat pump. In very cold areas, as the temperature lowers the heat pump outputs less heat (and will likely require defrost cycles which use power), ...


2

In theory, yes, you could repurpose an A/C unit to be a heat pump but that's not a good choice. In order to switch between A/C mode and heating mode, you would have to re-plumb the lines every time you switched between heating and cooling or fashion some sort of reversing valve mechanism of your own design to accommodate this. The American Standard ...


1

I blew out (by mouth) the rubber line coming back from the low pressure vacuum switch back to furnace near the drain. It initially had some resistance but then cleared. Everything worked fine after that.


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