HVAC - Compressor, fan and heating stopped working
#1
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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
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
#2
Both 120 volt lines are live.
24 volts being supplied to thermostat.
It's a Goodman ARUF303016BA
#3
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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.
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
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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.
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
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.