So I have a brand new inside blower motor and capacitor in my HVAC system. However I am experiencing this undesirable behavior where occasionally it (the blower) won't come on. The rest of the system turns on fine, so the cooling/heating coils get juice pumping through them, but the fan never turns on. Even more odd is that I can get the blower to turn on if I crawl under the house and switch the circuit breakers off and then back on. The next time I turn the AC on then the blower starts along with the rest of the system.
I've checked the wiring at the thermostat and even re-seated all the wires so that doesn't appear to be a problem. I also briefly inspected the green wire connection at the furnace and don't really see anything suspicious.
I have an older system which I don't believe has a float that shuts down the blower if the condensate gets too high... at least I can't find a float anywhere.
The furnace has an OLD humidifier component that I have no idea if it works, but it looks like it's connected up to the furnace wiring. Do that's a factor.
Any ideas what might be the problem? What else can I check or try?
As of 6/24/2017 I am still having this problem. However I did NOT have this problem during mild and cold weather... the fan worked just fine from like October until June. Now it's hot and VERY humid, and especially humid under my house where the blower is located. My impression is that the high humidity appears to be the culprit, causing something to fail.