20 Most Recent Honeywell RTH230B 5-2 Day Programmable Thermostat Large - Page 2 Questions & Answers

It has been my experience that the screen is damaged. You will most likely have to replace the thermostat. I have seen where heavy scratches will cause this condition.

Honeywell... | Answered on Jul 14, 2019

So if the temp changes what are you wanting to change? I'm confused.

Honeywell... | Answered on Jul 10, 2019

Typically the box will say "C wire required " Any 24v tstat will work, just make sure it doesn't say c required.

Honeywell... | Answered on Jul 06, 2019

When you turn power on/off your resetting the entire system. The problem is your air handling unit or outdoor unit. Something is locking out the system. Would need model number outdoor unit/indoor unit.
What breaker are you resetting? For what unit.

Honeywell... | Answered on Jun 18, 2019

Help how do I unlock this?

Honeywell... | Answered on Jun 14, 2019

You are not reading the manual. Even professionals have to read the manual. You likely are not in programming mode in the first place.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Honeywell... | Answered on Jun 05, 2019

And if what jumptrout51 said does not work, remove the thermostat to expose the wiring and place a jumper between (R) and (Y).

Honeywell... | Answered on May 27, 2019

It seems like since it's battery operated, you can still use the three wires only. R, G, and Y, and set thermostat jumpers or program accordingly.
The batteries will operate relays, LCD screen, but if I'm wrong, then the C terminal would need to be used both at the unit and thermostat to power the thermostat with 24 volts, not likely, just use one of the spare wires you mentioned or preferably the black wire.

Honeywell... | Answered on May 16, 2019

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