Question about Air Conditioners
I'm finally replacing my old but expensiveHoneywell Thermostat for the Carrier Infinity Thermostat that matches my Carrier Infinity 96% Furnace Model 58MVP 120.
It should be a no-brainer - 4 wires to connect. I turned off the furnace circuit breaker (15 amps) and uninstalled the Honeywell and reinstalled the Carrier thermostat. Green wire to Green thermostat connection, Blue wire to Yellow connection, White to White etc, and Red to Red etc. The one concern was on the thermostat it has a yellow connection, rather than the blue wiring coming out of the furnace.
Is there some special way to "turn on" these carrier thermostats? The installation and setup documentation that came with the box doesn't mention anything specific, except that there is a System On/Off switch.
The problem is the display screen never lights up - it remains dark. I've depressed the On/Off switch. I've held the On/Off switch for 20 seconds - nothing. Down in the furnace room the light in the viewer in the bottom right of the furnace base is on and constant- no blinking. The fan appears to be cycling through and then shutting off.
What to I need to do to get this Carrier thermostat up and running?
20 amp service? Secret handshake?
Thanks for all your help.
Eden Prairie, MN
Your old stat is wired for a traditional thermostat and not a communication stat like the new infinity you have. There is a module plug on the furnace board that will need to be connected to the new thermostat for it to work. The wires that are wired now are from a terminal strip inside the furnace. Please contact your local Carrier dealer. They may be able to get that harness for you
Posted on Jan 10, 2010
I have a Carrier split A/C Digital Thermostat. normaly it working but every day i saw the thermostat disply blinking PF.
Please advise me.
Posted on Mar 18, 2008
All connections at the furnace,t-stat and condensing unit have to be wired up to the 4-wire connector.Your honeywell was hooked up to the standard contoller connections.
Posted on Dec 27, 2007
You need a ground or common to operate the digital display, so five wires are required. it will connect to the c terminal in the t stat and the c or 24v common connection on the furnace control board!
Posted on Jun 12, 2008
This is common for the cooling wire to be either blue or yellow. It is the same thing. You connected it right; the white to white (heat) green to green (fan) yellow to yellow or blue (cooling) and red is the 24v. Did you make sure there is a jumper from RC to RH? Usually the display on these digital thermostats is powered by a couple of batteries. Some use power from the 24v system. It will have a C connection on the thermostat and will need another wire from the low voltage board for this to work though. Check the installation instructions for this feature. On these thermostats, check the back of the first piece for a gas/electric pin is set for your system. Also the low voltage setting is right also.
Posted on Dec 07, 2007
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