My A/C wasn't working, (The Blower wasn't coming on), so I jumped online and found a repair service. The guy came out to take a look at the system. He looked at the air handler for a few minutes and came down and told me the controller was bad. So he contacted his office and came back in and gave me an estimate, $668 for the new controller installed + $40 for the visit. That isn't a crap load of money but still I could find better ways to spend it, I would rather put it toward my Summer Vacation. He said he would have to go pick up the part and it would be tomorrow before he could come back. So I told him I would call when I was ready since it wasn't going to be fixed right then and there anyways. He left and I went and grabbed the model number for the Contoller, HK42FZ011, and jumped on Ebay. I found one used, It was $100 bucks, so I bought it.
I get the used controller and put it in, and it does the same thing. You hear the relay click but no dice. So jump back on line and find this bulletin:
-- Start Bulletin --
Bulletin United Carrier Corporation Technologies Carrier Residential Engineering SMB 96-0023 Subject: FURNACE CONTROL BOARD RESISTOR SOLDER JOINT FAILURES 04/17/96 UNITS AFFECTED: CAC: 58MXA, 58MCA, 58WAV, 58PAV, 58RAV BDP: 350MAV, 340MAV, 395CAV, 376CAV, 383KAV, 373LAV PAYNE: 480BAV, 481BAV, 490AAV Resco/Eventemp/Cobra: GB1AAV, GB3AAV SITUATION: A resistor solder joint failure mode has been identified on the following control boards used in the subject gas furnace. Affected Controls: HK42FZ004 (Obsolete) HK42FZ007 (Obsolete) HK42FZ008 (RCD Replacement) HK42FZ009 (Production, Open faced control board) HK42FZ011 (Production, Covered control board) Refer to Table 1 for the affected serial number ranges of the subject units. Table 1 CAC MODELS SERIAL NO. RANGE BDB MODELS SERIAL NO. RANGE 58MCA 3193A - 4595A 340MAV 3193A - 4595A 58MXA 3193A - 4595A 350MAV 3193A - 4595A 58PAV 1594A - 4595A 383KAV 1594A - 4595A 58RAV 1594A - 4595A 373LAV 1594A - 4595A 58WAV 1594A - 4595A 395CAV 1594A - 4595A 58ZAV 1594A - 4595A 376CAV 1594A - 4595A PAYNE MODELS SERIAL NO. RANGE RESCO/EVENTEMP SERIAL NO. RANGE /COBRA 480BAV 1594A - 4595A GB1AAV 1594A - 4595A 481BAV 1594A - 4595A GB3AAV 1594A - 4595A For further information on replacing these controls please contact your supplier.
--- End --
After reading that, I cracked the case open on the original to see what I could find. Right away i see that the Relay solder has melted away and there was no contact. So I drove up to Radio shack and bought an $8 Soldering Iron Kit, went home soldered the relay contact back to the board. Put it back in the Unit and has been working fine since.

So the $700 bucks I would have spent I ended up spending under $200, but if I would have had more knowledge, it would have cost my $8. So this is the reason why I posted this on my site, maybe it will help someone only spend $8 instead of $700. I am going to try and send back the one I bought on Ebay, if not, I will repair it and sell it on ebay.

My Ac Unit: Carrier 58ZAV11514122

-- Update -- I got another email today thanking me for putting this out there. It made me think I should come back and mention it has been two years and everything is still working fine (Broke in May 2006).

-- Update July 28, 2008 -- Thanks to Martin Ridgeway for sending me some pictures of before re-soldering the relay. I wasn't planning on putting this on my website when I "fixed" mine, so I didn't take any pictures. Here are the pictures Martin sent me: