Hmm that is good question
what you are saying it start to run ok but then on it's
slows down to the low speed: does it remain running at low speed
or does it shut down after while and how long does it take
before it slows down, it is possible that all it needs is some
lubrication or on other hand it could have shorts in winnings
or running capacitor could be going bad (opening or shorting)
there is several possibilities which only tech. can diagnosed
the problem at your equipment sight
I apologize for not leaving enough detail or background for those who
tried to take a stab at this one. I am not in the hvac trade, but
thought there might be a simple solution like check the wiring, try a
different 2-stage thermostat, or perhaps a known issue with the
handler model. If there are no possible simple things I can try, I
will of course be asking an hvac tech to stop by. The blower dropped
to low speed several evening ago and has not left low speed despite
the high outdoor temperatures of the last couple days. The little bit
of air coming out the supply vent is still very cold.
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