How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Phil Your Own Question
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7599
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
23932409
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

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

Customer Question

Have a T8411R Honeywell that no longer displays.
JA: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.
Customer: Is there a battery source?
JA: Is there anything else the HVAC Technician should be aware of?
Customer: Unit is over 10 yrs old
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 9 months ago.
Category: HVAC
Expert:  Phil replied 9 months ago.

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.