I don't want to lead you on a wild goose chase but considering you have a new house and probably modern appliances and systems, I wonder if you are having a problem with "dirty" power from a typical old style generator.
For example, I can run most things off of my generator BUT NOT my microwave. Some electronics, like those in my microwave, have problems with dirty power and, these days, electronics are buried in LOTS of devices.
The answer is an inverter generator that delivers clean power. They are also quieter and more fuel efficient. The downside is they are more expensive.
Again, I'm not sure this is YOUR problem, but I know the problem exists and that newer smart appliances are susceptible.
However, as others have pointed out, the STARTING load capacity of whatever generator you have MUST meet the needs of the device. In a quick look, air handlers, for example, can have a high starting load capacity AND can be susceptible to dirty power.
PLUS, not all inverters deliver pristine power. Some are better than others so a careful choice is needed. "Pure Sine Wave Inverters" deliver the cleanest power, similar to that delivered through power lines. Also the more expensive inverters.
Since you know which systems are NOT working with your generator, you should check the startup power requirements for each system and see if that system also needs clean power. Owners manuals and customer service might have answers. It can be a real hunt to chase the information down for your whole house. It might be easier to track down and borrow a pure sine wave, high capacity inverter and see if everything works while on that power source. If so, you have your answer.
If I am correct, the "whole house generators" usually work well because they have plenty of capacity AND pay attention to clean power requirements. They add in auto start and long running capacity to provide a no hassle solution. And again, you pay for what you get.
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