Honeywell T8600 Support Question
Honeywell T8600 Support Question
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Question posted by dave40757 on December 21st, 2015
Honeywell T8600c Thermostat
I had to uninstall this thermostat for a while and have now reinstalled it. It will not turn on the furnace or air conditioner and the display gives the time but that is followed by AC. What does the AC mean?
Current Answers
Answer #1: Posted by waelsaidani1 on December 28th, 2015 12:15 AM
waelsaidani1
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May 12th, 2013 Points: 19,501,787
Member since:
May 12th, 2013 Points: 19,501,787
If AC power is lost during operation, the display will show -AC instead of temperature.
check voltage between R and W or RC(R) and Y on the T8600, between R and C on the T8601, between C and B/C on the T8603; should be 24 to 30 Vac. Display will show -AC if no 24-30 Vac
When batteries are first installed in the T8600, T8601 and T8603, the display will flash -AC until the thermostat is powered from the system wiring
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