Refer to instructions that came with unit. Try 3.7 in instructions.
https://www.instructionsmanuals.com/download/termostato/Honeywell-RTH230B-en.pdf
SOURCE: I can't program my thermstat
go to www.honeywell.com. 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.
SOURCE: honeywell RTH230B
Normally, you should have 5 color wires: W-White, Y-Yellow, G-Green, R-Red and C-Blue.
The Blue wire is a common from the transformer on older systems, which is probably hooked to RC terminal.
Try this: Remove the blue wire and jump the RC to RH with the red wire and you will be fine. Blue wire should not be needed with the new thermostat.
This should also be stated in the instruction manual.
Hope this helps.
SOURCE: 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...
Geno
SOURCE: My Honeywell rth230b thermostat continues
Your snowflake should flash for about five minutes, that is the time delay built into the thermostat. It should stop after that and your system should begin to function.
SOURCE: flashing snowflake on display
That is a Time delay normal to keep the condensing unit from turning of and on to fast really save the life of the equipment
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