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

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-24-2008, 08:09 PM   #1
Newbie
 
Join Date: Oct 2008
Posts: 2
Rewards Points: 0
Share |
Question

Home Outside A/C Unit Won't Power Up


The unit has 220VAC to the relay, when I press in the relay the fan runs (but I don't know about everything else). If there is a way to know that everything is working would be good also. Any kind of trouble shooting. I did see 110vac on all terminals on the coke can looking deal (looks like a starter or something like that, has 4 or so wire terminals with wires going to relay and other things) A guy came out and told my mom that it was the computer board or something like that. So I took the one out of the outside unit whihc was pretty small board and I took the board out of the enclosure box outside of the unit and examined them. There doesn't seem to be any broken traces or any visual signs of burnt diodes or resisters or caps. I work at a radio shop and we do a lot of radio repairs down to the control boards so I figured I would take a look at both boards just for grins. Didn't find anything to put them back in. Would be nice to know what each of these boards do and where could I get replacements if needed? It seems like the tstat is not communicating with the relay that power everything? Or maybe the rel;ay is bad and that why everything turn on when I press it in (again I don't know if everything is coming on because the fan is so loud that it just seems like the whole system is running). It sounds like a normal A/C unit running but no air through vents. when I releasae relay of course everything shuts off. The tstat of course has been tried on cool and heat with on and off. There are no weird noises or anything. I couldn't get any voltage coming to the tstat. Have not tested wires coming from tstat to outside unit. Don't know which is which at each end. Wires don't look the same on tstat and outside unit. Breaker of course is not tripped because we have two 110vac wires coming in on relay. I'm no HVAC guy but I do know a little If anyone can help please give ideas.

ldeneale is offline   Reply With Quote
Old 10-24-2008, 10:37 PM   #2
Newbie
 
Join Date: Jan 2007
Posts: 16
Rewards Points: 0
Default

Home Outside A/C Unit Won't Power Up


IT sounds like a low voltage issue. Have you checked the fuse at the indoor unit?

Rookietinner is offline   Reply With Quote
Old 10-25-2008, 08:30 PM   #3
Newbie
 
Join Date: Oct 2008
Posts: 2
Rewards Points: 0
Question

Home Outside A/C Unit Won't Power Up


I just went under the house today and took out the main furnace contol board and checked the 3amp fuse and it was fine. I tried doing the test with connecting the C (Com 24V) to the test terminal and nothing happened. When I press in the button that the outter face plate presses in when It its put back on you can hear the relay or something clicking over and the red led flashed once and it sounds like a faint hum in the backgrond but when I release the button it goes away. There is no code on one flash and nothing happens on the face plate cover. It has code from 11 and up.
ldeneale is offline   Reply With Quote
Old 10-29-2008, 04:37 PM   #4
Newbie
 
Join Date: Oct 2008
Posts: 17
Rewards Points: 0
Default

Home Outside A/C Unit Won't Power Up


Replace the coke looking thing (capacitor) This starts the compressor and lets it run. it should have marking like 45uf-5uf just replace with same or 10% plus or minus and should go back to running fine!

Simpleman
simpleman1962 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Power inverter AndrewL Electrical 6 03-02-2008 01:43 PM
Sweating windows big daddy-o General DIY Discussions 15 01-06-2008 02:41 PM
Insulateing a Home Rifeman Building & Construction 9 08-31-2007 04:28 PM
A facelift for your home Grumpy Remodeling 0 07-07-2004 07:43 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.