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Our Carrier central air is unresponsive, nothing at all, no noises, air handler and condenser unit will not turn on, please help me before I lose more weight in my 150 degree attic. The serial # for the air handler is 0695803341 and the product # on AH is FB4ANF030000ACAA / we only have central air, system is not connected to any heat source Early sunday morning I turned the T stat to the off position, when i came home a few hours later I turned it back to the on position and nothing at all, no clicks or sounds of any kind. I checked the breakers at the panel, the service switch at the air handler, the fuses (installed exact replacements) at the exterior disconnect and still nothing. Our t stat is the round mercury type, which my in law thought might be defective, so we jumped the red and white ( I have Red, White, and Green), and still nothing. I got out the mutimeter and tested the LV volts at the T stat and with muti-meter set to 200v the reading was 03.7v. At that point we moved to the air handler, checked the 5 amp fuse on the PCB and it was not blown. Checked the volts at the low voltage wires , the readings were 03.7v. The volts at the transformer read 115v and 115 v input, output 03.7. Later I went outside to the condenser unit and visually inspected the contactor , nothing noticable no damage to the contacts. I pushed it in with a insulated screwdriver briefly and the fan and compressor came on. Then I tested the low voltage coming in , no reading. I also checked the LV at the contactor coil, nothing. I assumed, or we assumed, it was a bad control transformer. Installed new control transformer and nothing still not a click or sound of any kind. I did some volt tests with the mutimeter , the readings are 05.6v at every LV connection ( AH, Condenser, and T stat). Although at first I had no reading at the condenser and contactor coil. I ran a temporary 18G wire to the condenser from the air handler, only then did I get a Lv reading of 05.6. This was at 2 am this morning and was the last thing I tried with the same results , nothing. Thank you in advance for any assistance you can offer me

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I think you need to slow down and start fresh.
1) You have 115v at Transformer-You are reading from Red to White
on windings?

2) If that checked out OK are you reading 24v out of Transformer?
3) If yes, remove thermostat wires and put a jumper wire between
R and G. Put the Blower Door Back ON and turn on power
hopefully your fan will come on.

4) If the fan comes on, move the jumper between R and Y, put the
blower door back on and turn on power, indoor fan should come
on as well as the outdoor unit. If the happens you have a problem
with the low voltage wire being broke or a defective thermostat.

5) If none of the above happens and you do not have 24v Between
R and Y or R and G, but you have 24v on the secondary side
of the transformer, you have a defective control board.

Posted on Jul 21, 2010


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