View Single Post
  #15   Report Post  
Posted to alt.home.repair
Tony Hwang Tony Hwang is offline
external usenet poster
 
Posts: 6,586
Default How to test a wall thermostat to see if it's actually working?

John Grabowski wrote:
Just upload it here and you will get a URL you can post in a text
message. http://en.packupload.com/


OK. Here is the 9-page Payne 394 JAW PDF that Carrier sent me today:
http://en.packupload.com/085CHEN6AJG

I had also just finished converting it to PNG for upload to Flickr:
P1: http://farm6.staticflickr.com/5477/1...039c1493_o.png
P2: http://farm6.staticflickr.com/5515/1...819ab272_o.png
P3: http://farm4.staticflickr.com/3782/1...09270195_o.png
P4: http://farm6.staticflickr.com/5524/1...792398ca_o.png
P5: http://farm6.staticflickr.com/5488/1...c0dfefb3_o.png
P6: http://farm3.staticflickr.com/2889/1...1f5f9aa7_o.png
P7: http://farm6.staticflickr.com/5496/1...be96421a_o.png
P8: http://farm3.staticflickr.com/2892/1...6c147a7b_o.png
P9: http://farm8.staticflickr.com/7372/1...cdbe4107_o.png

I'll head on down to the furnace after checking the thermostat; but,
I'm tending to agree with you, that the thermostat looks too simple
to be the problem...



*Based on past experiences with customers, two things I suggest that you
check. Make sure that the disconnect switch for the furnace is on, and
make sure that the service door on the furnace is closed correctly. If
the service door is not closed properly the furnace will not run.

Hmmm,
Your furnace will have terminals marked on the boards; C, W, G, Y(if AC
is present. C is common lead for control power, 24V AC), W is heat lead,
G is fan lead, Y is compressor lead. If you jumper C and W heat with
come on and after some delay fan will start. If you jumper C and G fan
will run. Make ssure the furnace cover interlock switch is cheated with
a piece of tape.(this switch breaks power to the furnace when open)

You can do this jumper test from thermostat terminals too. Do you have
multi meter? Know how to it and read schematics? Fiurnace is just
simple one line logic sequence......