Furnace Only Runs Sometimes - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 10-03-2011, 04:05 PM   #1
Pro Flooring Installer
rusty baker's Avatar
Join Date: Feb 2009
Location: SW Missouri
Posts: 4,858
Rewards Points: 148

Furnace only runs sometimes

Furnace will come on and run fine sometimes. But does not always come on when it should. If you push the thermostat up to try and force it to come on it won't. If you set it on 70, sometimes when the temp drops it will come on, sometimes it won't. Bad thermostat? It works good when it comes on.


The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is offline   Reply With Quote
Old 10-03-2011, 04:18 PM   #2
biggles's Avatar
Join Date: Jan 2008
Location: Long Island
Posts: 3,630
Rewards Points: 2,000

remove the stat from the subbase see that R and W thats what the stat closes to run the heat..remove the W wire and touch it to the R the furnace should run if it short cycles or not at all it is the furnace....aas long as R/W it touching the furnace should run


biggles is offline   Reply With Quote
The Following User Says Thank You to biggles For This Useful Post:
rusty baker (10-03-2011)

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lennox Furnace G27M Series Unreliable operation: pressure switch or else? sheppard1977 HVAC 7 01-14-2013 05:42 PM
Rheem 80% Furnace Short Cycling rlukas79 HVAC 0 12-19-2010 03:27 AM
What runs before furnace starts rosco HVAC 12 03-20-2010 10:57 AM
furnace runs for short periods dodge1972 HVAC 3 01-08-2010 09:54 PM
Problem with Lennox Pulse Furnace Wiring to Thermostat scalvin Electrical 4 12-30-2009 07:48 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1