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Hello i have a Honeywell RTH230B programmable electronic thermostat and i need to reset the times and temp for the 4 phases of the day how do i do this i now longer have the instructions there is a 1-800 # i used at other times but no longer have that for honeywell

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Posted on Aug 24, 2008


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Posted on Jan 02, 2017


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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: . 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 . The direct link to the manual in English is .

I hope this helps.

Cindy Wells

Dec 07, 2017 | Heating & Cooling

1 Answer

I couldn't figure out how to amend my last question, so here is one more piece of information. I just put batteries back in and reset the time/date. The Temp Up and Temp Down buttons WORK FINE

your thermostat may be locked go to honeywell web site punch in thermostat model # and look for set up pushing two button at the same time gets you in but you will need instuctions for set up

Jan 31, 2015 | Honeywell RTH230B 5-2 Day Programmable...

1 Answer

Heat not coming on. battery died.

Please go to the link and check graph "2.5 Installing the Batteries". Its really easy so it should be a piece of cake.

Mar 30, 2014 | Honeywell RTH230B 5-2 Day Programmable...

1 Answer

Hello. Our RTH230B thermostat has a mind of it's

I think your feedback temp sensor has faulted, get it looked at.

Jan 24, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a Honeywell programable RTH230B. I changed

Go to
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Jan 08, 2010 | Honeywell Focus 6300B 5-2 Days...

1 Answer

No heat in zone with Honeywell rth230B

It is not your thermostat, it is an airbound zone. The gurgly noise you heard was that water and air flowing through the radiator. The zone needs to be purged either at the boiler, or through vents on the radiator. Hope this helps

Nov 01, 2008 | Honeywell Electronic Programmable...

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Problem with Honeywell RTH230B Thermostat

I have my temp on C and I need to change back to F I have the RTH230B programable

May 30, 2008 | Honeywell Programmable Thermostat Heater

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Honeywell rth230b won't shut off heat

Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.

Hope that helps...


Mar 07, 2008 | Honeywell Programmable Thermostat Heater

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Honeywell Programmable Eletronic Thermostat model RTH230B

There are so many products, we cannot help without the model no. Try typing 'Honeywell programmable electronic thermostat' into google and searching for an image of your thermostat, then get the model no. Then you might be able to get some help.

Dec 20, 2007 | Honeywell Programmable Thermostat Heater

2 Answers

I can't program my thermstat

go to There you will find a search tab. Type in the exact model number of your thermostat. You will be able to download the installation/owners manual.

Nov 29, 2007 | Honeywell Programmable Thermostat Heater

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