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The digital display is not functioning

I have T8000C Honeywell thermastat. The digital display is not displaying. The 3V fuse on HVAC circuitboard was blown and has been replaced. The wiring at the thermastat is reading 24vac across all the wiring options yet thedisplayisnot reading. Is the thermastat shot or is there something else I need to do?

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The thermostat could be bad. It may have gone bad on its own or due to a short in the supply wiring. Sometimes mice will chew on the wiring in the wall that leads to the thermostat. But I wouls change the thermostat. They do go bad. Make sure you turn the inside unit off first in case you accidently touch wires together. This will blow the transformer inside the unit if the fuse doesn't blow first. I even scene thermostats with fuses inside. So you may want to take the thermostat apart and check for inside fuse also.

Posted on Jun 18, 2009

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Posted on Jan 02, 2017

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