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Anonymous Posted on Jul 22, 2014

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Can I replace my old Honeywell Round thermostat with the Honeywell non-programable,RTHL3550D

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frankpena94

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  • Posted on Oct 26, 2014
frankpena94
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Yes, it should work. Old thermo has 4 wires, follow instruction with new thermo.

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New instruction manual for RTH230B

Do you mean the Honeywell RTH230B programmable thermostat? Most of the Honeywell thermostat manuals are available here: http://yourhome.honeywell.com/en/faqs/thermostat . Scroll through the pages to find the RTH230B or use the search feature. The search engine found the installation and user guide in three different languages, see https://yourhome.honeywell.com/en/supportsearch#q=Rth230b . The direct link to the manual in English is https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1800.pdf .

I hope this helps.

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5-1-1 Day Programmable Thermostat - Honeywell

yourhome.honeywell.com/.../thermostat/5-1-1-day-programm...

HoneywellSet the Honeywell 5-1-1 day programmable thermostat to your maximum comfort settings. Works with heat pump systems. Buy now!
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I am replacing an T8411R with RTHL3550 and I have the following wires. Original vs New G=G,R=R,Y=Y,O=O......? I have a W2 and an E wire that go into different screws on original but no seperate terminal...

C is actually a power wire; it provides power for some programmable thermostats. You don't have to connect it on the new thermostat; cover the end with electrical tape to avoid it causing a short. (If you keep that wire accessible, it will be nice for someone who wants to use another programmable thermostat. The ones which can talk to wireless networks require this wire.)

Do you have a heat pump? That is the only time a thermostat uses an E wire.

The W2 wire should go to AUX (third screw terminal from the left) and the E wire should go to E (second screw terminal from the left). See page 25 (27 on the pdf) of the Quick Installation manual for the RTHL3550. This manual is available from Honeywell at http://yourhome.honeywell.com/home/Products/Thermostats/Digital-Non-Programmable/RTHL3550D.htm .

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God bless you
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Bae lo This is the message my electric Honeywell programable thermostat is flashing. It's still working. What's that mean? Thanks.

Try with this site:

Honeywell thermostat website: http://yourhome.honeywell.com/home/Applications/SmartSearchResults.aspx?searchkey=thermostatfor heating
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