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Have a T8411R Honeywell that no longer displays. Is there a…

Customer Question
Have a T8411R Honeywell...

Have a T8411R Honeywell that no longer displays.

Contractor's Assistant: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.

Is there a battery source?

Contractor's Assistant: Is there anything else the HVAC Technician should be aware of?

Unit is over 10 yrs old

Submitted: 2 years ago.Category: HVAC
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Answered in 13 minutes by:
2/16/2016
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,878
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello,

This should be the manual for that thermostat.

https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1037.pdf

If you have a volt meter test for 24 volts as marked in the screen shot below

http://screencast.com/t/xFo1EfFWSr

If you have 24 volts there, the thermostat is bad. If you do not have 24 volts across those two terminals

then there is something wrong inside the heat pump air handler, a blown 24v fuse, bad transformer, broken wire or etc.

Let me know if you need training on how to do further diagnosis and repair.

We can go from there.

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