On Wednesday, August 27, 2014 3:09:34 PM UTC-4, wrote:
On Wed, 27 Aug 2014 14:19:08 -0400, Jan Philips

wrote:



It was working again until today. The thermostat is a basic Aprilaire

model.



I left it set on 74 and it was 77 when I got there - same as before,

but not so hot, so it must have been working until a few hours ago.



I went through the procedure that worked the other two times. This

time it did not work. The 'stat has an indicator that indicates that

it is calling for cooling. It was flashing "cooling" when I turned it

back on. Then after the minute or two delay, I heard the click that

is made when the compressor starts. But the compressor did not start.



We are renting out this house starting sometime in September, so I

need to make sure it is fixed, so I called my usual repairman.



Thanks for all of the helpful replies and ideas.



Be aware there may be a time delay relay in the compressor control box

that prevents it from starting within 3-5 minutes after the call for

cooling on a restart.

Which could be a factor, especially since she said the thermostat was
*flashing* cooling. I think that's a sign it was enforcing it's delay
before restarting, meaning the thermostat thought the compressor had been
switched off within the last few minutes. As you point out, if the
compressor also has it's own protective delay, it could just be that the
delay at the compressor is longer than the delay of the thermostat.

The obvious questions is what happened after about 10 mins? If it
didn't start then, she can rule the delay out. Also the fact that the
temp was 77, while set to 74 suggests something isn't right.