Self Help Forums

Go Back   Self Help Forums > Repair > Heating & Air Conditioning - Existing Home
Register FAQ Members List Calendar Today's Posts

Heating & Air Conditioning - Existing Home Heating & Cooling / Repair , Additions & Problems Solving Solutions

Reply
 
Thread Tools Display Modes
  #1   IP: 70.32.248.244
Old November 30th, 2010, 03:44 AM
Tom-KY Tom-KY is offline
Junior Member
 
Join Date: Oct 2010
Posts: 7
Default Thumping noise from heating system.

We have a Coleman furnace with a Intertherm outdoor unit {heat pump}. It has a Hunter programable thermostat. It makes a thumping noise sometimes right after turning on, sounds kinda like water hammer. You can feel it in the house but it is so intermittent and lasts only a few seconds that I can never see what the outdoor unit is doing when this happens. When this happens is is usually early morning or at night. Had a service guy out last week and he could not find anything, said if it was his he would just run it. This system is 8 years old. Tempted to try a new thermostat to see if it is causing it to kick in and out. Any suggestions? I want to prevent any harm to the system.
Reply With Quote
  #2   IP: 130.76.32.216
Old November 30th, 2010, 11:58 AM
suemarkp suemarkp is offline
Super Moderator

 
Join Date: Dec 2003
Location: Kent, WA
Posts: 8,196
Default

What is making the thumping sound -- the outdoor unit, the air handler, the thermostat? Put your hand on each unit when it starts and try to feel the thump. Also feel the refrigerant lines and duct work.
__________________
Mark
Kent, WA
Reply With Quote
  #3   IP: 70.32.248.244
Old November 30th, 2010, 04:44 PM
Tom-KY Tom-KY is offline
Junior Member
 
Join Date: Oct 2010
Posts: 7
Default

Quote:
Originally Posted by suemarkp View Post
What is making the thumping sound -- the outdoor unit, the air handler, the thermostat? Put your hand on each unit when it starts and try to feel the thump. Also feel the refrigerant lines and duct work.
It is so intermittent that when you get to the inside furnace it has quit. You can feel it in another room when it happens. Just does it a few seconds and quits. I decided tonight to turn off the heat pump and let it run on the electric furnace tonight to see it it stills does it. I am wondering if the thermostat is somehow turning the outside unit on and off make the refrigerant surge. Just a guess right now, going to try to eliminate things one by one.
Reply With Quote
  #4   IP: 70.32.248.244
Old November 30th, 2010, 05:37 PM
Tom-KY Tom-KY is offline
Junior Member
 
Join Date: Oct 2010
Posts: 7
Default

I forgot to add the when it does this the lights are dimming and going bright like something big is turning on and off.
Reply With Quote
  #5   IP: 72.38.193.87
Old November 30th, 2010, 06:39 PM
joed's Avatar
joed joed is offline
Super Moderator

 
Join Date: Dec 2003
Location: Welland Ontario
Posts: 4,594
Default

Sounds like you have a loose neutral in your service. Light going bright is a classic symptom of loose neutral. This can be very damaging to electronics.

You need to have this checked ASAP. Call the POCO and describe the light going bright to them.
Reply With Quote
Reply






Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 03:46 AM.


Powered by vBulletin® Version 3.6.7
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
© 2002 - QuinStreet, Inc.
http://www.selfhelpforums.com