Had the furnace checked. It turns on for a few seconds and than turns right off without putting out any heat. Repair person said to remove batteries from Honeywell thermostat and let it purge. Reinstalled and the problem still exists. Does the thermostat need replacing? If so how difficult a job is it to do oneself?

 

Try this first. Remove the thermostat. Jumper the W and R terminals, some t-stats have an R and Rh, if so jumper W and Rh. If your furnace works and stays on, replace the stat. If you get the same symptoms,the problem lies elsewhere.

 

Being a layperson, what is meant by jumper the W & R terminals. I see from the Honeywell website that terminals are labeled but I am not sure how to go about testins as you indicated. System worked fine again after shutting down and purging as service indicated. Early this morning the same thing happened. Igniter kick on than shuts right back off before any heat comes up. If system is left on, fan will eventually come on and blow only cold air

quote:<HR>Originally posted by fjrachel:
Try this first. Remove the thermostat. Jumper the W and R terminals, some t-stats have an R and Rh, if so jumper W and Rh. If your furnace works and stays on, replace the stat. If you get the same symptoms,the problem lies elsewhere.<HR>

 

Remove the tstat from the subase.Take a piece of wire 6" long,place one bare lead on "W" and the other on "RH" or if you only have "R" place it on "R".You have now become the thermostat!!!!!Hold the leads on there steady.Have someone watch to see if the burner lights.Allow the fan to cycle on,remove the "JUMPER",the 6" piece of wire,allow the fan to cycle off....Repeat this 8 or 10 times....if the burner lights each time and the fan cycles on,it's time for a new tstat.PDF I'm adding to the message.I know new inventions and ideas are great,but I'm from the old school.I have no room in my heart for the type of tstat you have.The battery goes dead,purge,purge,purge,reprogram,reprogram,reprogram.Lost the directions for reprogramming?OOPS!!!!Haven't progrmmed it for a while...OH GOSH and how did I do that last time?With a standard mechanical tstat with mercury switches allyou would have to do to troubleshoot would be to cup your hand over the tstat and watch for a slight spark which would immediately indicate that a signal was being sent from the tstat to the heating unit.BUT,however to each their own.PDF...Goodluck!!!!!

[This message has been edited by PDF (edited November 21, 2000).]