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My air handler isn't working, red light is flashing so it appears to have power, but the thermostat LED display is blank????

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Does the thermostat run off battery power or does the transformer supply power to the thermostat. You can check this by removing the thermostat face and checking for a wire connected to the C terminal. If there is no wire there then it is battery only. Replace the batteries. If you have the brand and model # of the thermostat, you can do a Google search for the owner's manual. Of course there is always the possibility that the thermostat has gone bad.

Posted on Sep 06, 2010

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1 Answer

Thermostat display is blank


Could be a couple things. First open the thermostat and replace the batteries. Second thing it could possibly be is you may have a float switch which is usually a plastic piece with a wire by your air handler unit. Lift the plastic part with the wire out of the safety switch and see if your thermostat has power again.

May 04, 2014 | Heating & Cooling

1 Answer

What do i do. Im getting 230 volts to unit. Not getting the power light to come on .. the display doesnot appear.


Not sure what power light you are talking about, or what type of HVAC system you have. Though you say that the display does not appear. Is the display on a programmable thermostat? If so, most programmable thermostats use an internal battery for power and not the low voltage side of the air handler. So check your thermostat to see if it does take a battery(s) and try changing them.

Apr 27, 2014 | Heating & Cooling

1 Answer

The display went blank on my honeywell t8600c thermostat. when the batteries were changed, the display shows the time and -AC. Nothing else functions


I believe this thermostat will display -ac if it loses power from the furnace or air handler. Your thermostat will operate on low voltage(same as your door bell) and constantly powers your thermostat. I would check your furnace breaker, and fuses to see if there is power to the equipment

Nov 03, 2013 | Heating & Cooling

1 Answer

I cant get the ac ( cool ) to work , it read HOLD @ 82 degrees. I'm sweating over this


Hello my name is Heath it will be my pleasure to assist you. Your thermostat may be on the blink and need to be replaced. But first lets try a couple things first take the batteries out of the thermostat and let the display go completely blank ( aprox. 5 mins.). While that is going blank go to the indoor air handler and turn the power off to it either from the switch or the inside panel box. Then once the display has gone blank turn the power back on and put the batteries back in. Then set the switch to cool and turn the temperature down and press hold and try it like that to see if it goes back to heat if it does then the thermostat is changing the temperature on its own and going into heat mode and will need to be replaced.

Sep 11, 2011 | Heating & Cooling

1 Answer

I have the T8775 model and the display went blank last night. Now the A/C is not coming on. Any suggestions on what I can do to fix it or what happened to it?


It is possible the batteries are dead in the t-stat.
If batteries are good check the power to the air handler.
If power is good the air handler transformer may be bad.(high voltage in and low voltage out)
If transformer is good check all low voltage thermostat wires especially red and blue.

Aug 02, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I have a carrier 38ckc026 and a two zone thermostat system. both thermostat displays are blank & a/c doesnt work - what should i look for before calling an hvac repairman?


Hi,
The 24v transformer blew or if you are lucky there is a fuse in the line before the transformer...

Check in the air handler to make sure the cover is on right... then check for power to the air handler, then check ofr a fuse on the circuit board, finally check the transformer...

The problem lies in one of those things...

heatman101

Sep 05, 2010 | Carrier Heating & Cooling

3 Answers

Jan 12, 2010 - My air handler fan (american Standard #TWE065E13FBO) works during a/c operation but not during heating operation. Checked continunity through the the thermo sw and throught the heating coils...


Hi,
You need to check if the air handler fan running.Suppose if you donot see it then, check to see if the fan on the outside unit is running. If the fan on the outside unit is not running either, check to make sure that the breakers for the furnace/air handler and the air conditioner are on. Also if the breaker is not tripped, then the problem may be your thermostat, the furnace/air handler control board, or the wires between the furnace/air handler and the thermostat.

Let us know if you need further assistance.
Thanks for contacting Fixya.com

Jan 12, 2010 | Heating & Cooling

1 Answer

My goodman air unit wont turn on but has power to the relay and can be manually overridden at the relay but doesnt sound like the air handler comes on. I changed the batteries in the thermostat and even...


Check the transformer. There could be a chance that the transformer is out. If you mean you can manually turn on the unit by pushing in the contactor switch in then theres your problem The thermostat engages the low voltage side of the transformer sending 24 volts to the contactor switch engaging the system if this transformer is out it will not engage the contactor to turn on the system.. Also on the air handler at the door on the bottom of the airhandler there should be a small circle of clear plastic by looking inside of this circle you should see a green led . If you see a red led it will be flashing count the flashes as they are emmited and once you see the pattern they have then remove the bottom door of the airhandler and on the bnack of this door is a code that corresponds with the flashes i.e. 3 red flashes, pause, three red flashes. The code will tell you what is occuring within the system. However, If your system is not a newer model it may not have the leds as I have described. If that is the case the first part of this solution may correct the problem.

Good Luck on your repair

Dave

Aug 31, 2009 | Goodman CLT24AER24 Air Conditioner

2 Answers

Honeywell T8000C Thermostat Problem


If you have a volt meter, remove the thermostat off from the mounting plate and check for 24 volts AC across red (R) and White (W). Then check across Red and Yellow (Y). If you do not find any voltage, follow wire as much as you can all the way back to the air handler that is connected to it. Look inside and see if there is a small Auto (car) type of fuse in the wiring harness. Test and replace if necessary. Jump out the Red and Green terminals on the air handler and replace the door. See if the blower turns on. If so, you have narrowed it to the wiring to the thermostat. If not, you have a power problem and will need a technician.

Sep 28, 2007 | Heating & Cooling

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