HVAC - Compressor, fan and heating stopped working

Reply

  #1  
Old 03-28-18, 06:04 PM
Member
Thread Starter
Join Date: Mar 2018
Location: USA
Posts: 2
Received 0 Votes on 0 Posts
Question HVAC - Compressor, fan and heating stopped working

My HVAC completely stopped working today, Neither heat, fan or compressor turn on.

Things I've checked...
Both 120 volt lines are live.
Board fuse okay.
24 volts being supplied to thermostat.
Bypassed thermostat by jumping red to fan, compressor and heat with no effect.

It's a Goodman ARUF303016BA

Any ideas on what it could be and how to check?

Thanks
 
Sponsored Links
  #2  
Old 03-28-18, 10:21 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,373
Received 10 Votes on 8 Posts
Both 120 volt lines are live.
Because of back feeding you would want to see 240 volts between L1 and L2 (not just 120 volts between each leg to ground).

24 volts being supplied to thermostat.
Did you measure 24 volts or are you assuming this because the low voltage fuse looks good and you measured 120 volts between each leg to ground?

It's a Goodman ARUF303016BA
This is an air handler model number. Did you measure the voltage at the air handler or the outdoor unit?
 
  #3  
Old 03-28-18, 11:15 PM
Member
Thread Starter
Join Date: Mar 2018
Location: USA
Posts: 2
Received 0 Votes on 0 Posts
Thank you, thank you, thank you! Your questions lead me down the right path. One of 120 v lines was dead as I never measured between both 120's. All it took was replacing a 30 amp buss fuse at the air handler cut off switch.Did not blow again so probably not a short and the fuse looked ancient compared to the one that was good so guessing it just went bad.

To answer your questions...

I was only seeing 0.1v when ac voltage was measured between L1 and L2. Wasn't sure how to measure 240 as I was thinking of doing that but thought it might short circuit by just measuring between them.

24 volts was read at the thermostat from the red wire to earth,

Goodman ARUF303016BA is the air handler model number and where I was checking for voltage.

Thanks again! Will sleep comphy tonight.
 
  #4  
Old 03-29-18, 04:30 AM
Member
Join Date: Oct 2016
Posts: 1,425
Received 36 Votes on 33 Posts
That’s a common mistake. Always measure across a circuit, not to ground.
Your air handler uses a 208/230 V circuit, not 2-120V circuits. Kinda the same thing in a way but just for future reference.
 
  #5  
Old 04-09-18, 08:50 PM
Former Member's Avatar
Member
Join Date: May 2006
Location: US
Posts: 782
Received 0 Votes on 0 Posts
You may have a failing capacitor causing the fuse to blow, if it happens again replace the capacitor. Just did one this afternoon it was a 45/5 440 vac had only 13uf on the 45 leg. it was intermittently blowing the 30 amp fuse in disconnect every so often when compressor tried to start. Common issue.
 
Reply

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


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: