I have a tempstar furnace which worked fine till a week ago..for a time the blower motor would make a humming sound before kicking in...now nothing. I checked the thermostat and there is no spark when you flip the mercury switch side to side. I tried the crossng w/r trick at the thermostat and on the furnace..nothing...no spark no nothing. What is the next step? new blower motor?
OK understand one thing :I know that unit but I am no there with you. So I am condtionally saying the transformer is gone.
As long as you had power to the furnace and you pushed in the safety switch when you tested the 24 v side of the transformer and got nothing than it should be it.
I would bench test the transformer out side the furnace. If it still checks bad buy a 40va 120v to 24v transformer,
Now listen, trans former don't usally go bad on their own.
Before you you put the new one in remove all the thermostat wires from the RWYC terminals. Install the new trans. Wit the power off of course.
When you get it first turn the heat up as highe as it goes. Connect red to R terminal.
Turn on power and check for 24v from R to C. If you HAVE 24V put white wire to W terminal.
It should fire now.
BEWEAR YOU COULD HAVE A SHORT IN THE T'STAT WIRES. CHECK EACH WIRE WITH AN AMP METER AS YOU PUT IT ON, IF THE AMPERAGE STARTS TO CLIMB OVER 1 AMP KILL THE POWER. THAT WILL BE THE WIRE WITH THE SHORT.
nOW I AM GONNA GO GET LAID AND POP SOMe PILLS I DESERVE IT.
Thank you for your time and mostly the help i know it was probaly real trying on your end to put up with my constant pestering.., that was the problem so a new transformer was 30 bucks, it is in and installed...and we are warm.:thumbup::thumbup::thumbup:
Buhler
Sounds to me like you have a low voltage problem with a fuse to the transformer or the transformer itself. Find the transformer and see if you have 24v on the red/blue or yellow/blue wires from transformer. If no voltage either transformer or fuse leading to transformer (some units do not have fuses inline with transformer.
Hi, I'm in the suburbs of Detroit also. And I have the same problems as buhler. Transformer shows 24 v. no blower, or ignitor action. Have 80s Comfortmaker electric ignition, vents thru chimney, no inducer. I've jumped red and white at thermostat, nothing. 120v to furnace OK, blower door switch held in I can hear very slight hum, I'm thinking from the transformer. Blower cage spins freely. Any thoughts, or what did buhler do? Thanks
Funny you should mention this right now; I was just taking inventory of parts stock and I got more parts for your furnace then I'll probably use on a service call..
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
DIY Home Improvement Forum
3.1M posts
319.6K members
Since 2003
A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Helping You to Do It Yourself!