Originally Posted by Drsasser
I saw the op had replaced the original thermostat because of the very reason we want to do the same, So I ordered a Honeywell digital from amazon model number RTH5100B, Everything went well except the a/c would not come on, Fan worked, heater worked but no A/C, Setting down trying to make sure I had it all wired correctly and the A/C kicked on and started running.
So I located the manual and started reading, Seems the thermostat waits 5 minutes to make sure not to damage the A/C compressor called Quote
"built in compressor protection" This feature helps prevent damage to the a/c or heat pump system. Damage can occur if the compressor is restarted too soon after shutdown This feature forces the compressor to wait a few minutes before restarting.
During the wait time the display flashes the message "cool on" When the safe wait time has elapsed the message stops flashing and the A/C starts working. End Quote.
My problem is it waits several minutes when I first turn it on!
This feature I do not like but in reading the book I can't see any way to disable it.
I may have wasted $50.
Mine does that but only when:
1 - I have turned the AC off then turned it right back on, or
2 - When I have removed 12 VDC for whatever reason and restored 12 VDC.