Question about Honeywell Programmable Thermostat Heater

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The thermostat worked correctly for months then

The thermostat (Honeywell RTH230B) worked correctly for months then the screen went blank. Changed batteries, screen still blank.

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  • 587 Answers

Go to honeywell.com
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

Posted on May 10, 2010

  • nothot4now Mar 01, 2011

    I just experienced the same problem. This thermostat has worked great for over 3 years. But today, when the thermostat is in the HEAT position, the display is blank. When the switch is returned to the OFF or COOL position the display comes on but the time is reset to 12:00. I called Honeywell tech support and they had me reset the controller. (remove batteries, press and hold the MODE button, insert batteries, release MODE button). This did not help. The HEAT mode display is still dead. He told me they as far as he new, this was a new problem and I would have to buy a new thermostat. I don't think I'll buy another Honeywell!

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Posted on Jan 02, 2017

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Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
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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.

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