Honeywell Programmable Thermostat Heater "switched thermostats cool heat nothing" Questions

Robertshaw Thermostat 9500 change batteries -- I replaced the batteries on an older model Robertshaw Thermostat 09500 and the display & system will not go back on. There is a switch under the cover --

...nothing Then I tried taking out the blue wire, and leaving the Red wire plugged into Rh while using a jumper to connect Rh to Rc - still no results, all I get is a flashing snowflake that goes solid ...

...thermostats setup in 1 zone. the thermostat with the lowest temperature will reign supreme. The heat setting on that thermostat will be what's causing the buzz on the heater. optionally, hard reset ...

...Cool, off, heat and EM. Heat. The setting switches to EM. Heat each time the transformer goes out. I noticed this the first time it went out 2 weeks ago and thought nothing of it. I replaced the ...

...switched in too heating and cooling modes but nothing happens. It is easily ebough to program it. Trying to manually change themp I get no reaction from the funace or AC. It is an older OIL burner ...

honeywell RTH230B I've just replaced my old thermostat with a new honeywell RTH230B but it didn't work. I installed it exactly as the instructions guided. The fan is supposed to run when switching to

...thermostats are either powered by batteries or by the 24 volt transformer from the furnace. Usually the standard heat/cool type that you may have is powered by batteries and will show a low battery ...