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Hello, I will be working on this issue with you.
Tell me if you can how long this poor performance has been going on, had it worked properly earlier?
Does it only fail cool on very hot days, or does 78F seem to be the limit.
We can go from there.
For a time, back in the 80's title 24 energy code was adopted that required that thermostats be set no cooler than 78F in cooling mode and no warmer than 68F in the heating mode.... it is possible that your system was sold in that time frame, those laws are no longer in effect.
If this is in a larger building and you are in an apartment, it is likely that the main office remote controls the allowable temperature settings... if indeed that seems to be the case, tell me if other tennants or condominium owners are having the same problems.
Thanks, ***** ***** give the model number of the honeywell thermostat you just installed, and tell me which color wire you connected to which terminals on the thermostat, there are a few easy tests we can do.
If I miss you tonight I will pick up your response first thing in the morning,
Hello again, sorry for the delay we had a storm here that disrupted the internet connections.
set dip switches on the extreme left, TL1c, Tl2c, and Tl3c in the up position one at a time, and monitor how the system behaves... I did not see any instructions in the manual on how to set them either way.
If that fails to produce the desired results and the system still shuts down after 5 minutes use a paper clip wire to make a jumper between red and yellow at the thermostat terminal strip inside the unit (not at the thermostat) you sent a picture of it, and notice if the system starts producing heat or not, if it produces heat, connect red, yellow and brown together using jumpers... tell me if the system cools and keeps cooling, or not. Try this with different dip switch settings on the extreme left.
We can go from there