Honeywell Programmable Thermostat Heater "changed batteries heat" Questions

Changed battery in Honeywell thermostat last night due to "replace battery warning". This AM, no heat. Other zones were working so I am thinking that I did not properly reinstall thermostat.

changed the batteries and still nothing changed. Please help me. I live in CT and it is quite cold right now. One of two things either the disply has gone out which is likely as it is a common failure

...heat never turned off. Had to shut off furnace. Changed battery then worked fine. did the same thing today no such luck. Had to shut furnace off tonight , will be 25 degrees any help would be nice. ...

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 --

...thermostat display is blank no heat Change batteries, the display should come up. If not, the thermostat is probably defective. Some of the cheaper White Rodgers stats require batteries to

changed the batteries, still no digital read out and no heat is my thermostat( honeywell rth1108) somehow to my attic fan. cant find a off switch for the fan. seems it is controlled by the thermostat

...batteries in its correct position; if you have a programmable thermostat; do the same with the hit 'reset filter' held down observe if the roomTemp reading has changed. May I suggest to keep an extra ...

...heat up again unless I manually switch theheater on and off. I tried changing batteries in the thermostat and have read the operating manual cover to cover trying everything. cfheck to make sur ethat ...

honeywell chronotherm IV plus controller Hi, I did a battery change and when I replace front cover, noticed two bent electrrical 'pins'...now it won't power up and we have no heating! Do I have to ...