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I have a honeywell (Alliance) T8001 series unit and the display has gone completely blank but the fan switch works and so does the cooling and heating i think. I need an answer ASAP

There are no LED lights and the whole thing works but its like a buff man with no eyes for comparison

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Thermostat auto-changeover mode unavailable

when you programed it did you go through all the setup #1-0 ,#3-0 ,#5-5 ,#12-1

Posted on Nov 25, 2008

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SOURCE: fan coil unit won't cool or heat in room1 while room2 runs well

could be undercharged, or overcharged, or wires weren't put back on valves in unit.

Posted on Feb 16, 2009

  • 118 Answers

SOURCE: problem with thermostat (honeywell rth111/221).

should be installed with
1) red to rc and jumpered to rh
2) green to g
3) yellow or blue to y
4) white to w
to test: remove t-stat connect white and red - furnace should operate normally unitil you disconnect.
if it does replace t-stat

Posted on Oct 27, 2009

heatman101
  • 43501 Answers

SOURCE: honeywell t8000c display is blank, unit doesnt run

I would say that you have one of two issues. Either your thermostat is bad or you do not have 24v coming from the heating unit. In this case the problem would be in the low voltage circuit of the heater. At the heater you should have 24v AC when you place an electric meter across the R terminal and the C or W terminal. If you have no vaoltage across the R to either the C or W then you have a bad transformer or a blown fuse in the furnace. If you do have voltage ther and also at the t-stat then the t-stat has gone bad, replace it.

Posted on Nov 14, 2009

GeOrGeEtUk
  • 332 Answers

SOURCE: display screen has gone blank

Hello,

You would need to change the screen. Go to a phone repair shop to assist you in changing the screen. It will cost you a little.

Best regards

Posted on Jun 06, 2010

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I would say that you have one of two issues. Either your thermostat is bad or you do not have 24v coming from the heating unit. In this case the problem would be in the low voltage circuit of the heater. At the heater you should have 24v AC when you place an electric meter across the R terminal and the C or W terminal. If you have no vaoltage across the R to either the C or W then you have a bad transformer or a blown fuse in the furnace. If you do have voltage ther and also at the t-stat then the t-stat has gone bad, replace it.

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