Posted: 7/25/2014 6:42:28 PM EDT
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Folks,
Quick question....What are some troubleshooting tips for a central AC unit that will not turn on at all, neither inside nor outside unit is working. Breakers are all in the on position (I have reset them) and I swapped out the thermostat, just in case. Drain pan has a tiny bit of water in it, but not nearly enough to flip the kill switch. I did notice some water coming from the outside unit, but it doesn't seem like an awful lot... Any ideas? |
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Quoted:
tformer 24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. |
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Quoted:
24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. Quoted:
Quoted:
tformer 24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. Sounds like I need to get a multimeter.....I'll update when I check the above. Just to make sure I'm clear, would the transformer be on the outside unit or the inside? |
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Quoted:
24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. Quoted:
Quoted:
tformer 24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. This, or check batteries in T stat if it has them, check 3 amp fuse on the board if it has one, make sure blower door is on correctly so door switch is closed. |
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This, or check batteries in T stat if it has them, check 3 amp fuse on the board if it has one, make sure blower door is on correctly so door switch is closed. Quoted:
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Quoted:
tformer 24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. This, or check batteries in T stat if it has them, check 3 amp fuse on the board if it has one, make sure blower door is on correctly so door switch is closed. Tstat has been completely replaced, including batteries. It's a carrier unit, any advice on how to confirm what the transformer is? I took the cover off and there are all kinds of things on there. |
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Tstat has been completely replaced, including batteries. It's a carrier unit, any advice on how to confirm what the transformer is? I took the cover off and there are all kinds of things on there. Quoted:
Quoted:
Quoted:
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tformer 24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. This, or check batteries in T stat if it has them, check 3 amp fuse on the board if it has one, make sure blower door is on correctly so door switch is closed. Tstat has been completely replaced, including batteries. It's a carrier unit, any advice on how to confirm what the transformer is? I took the cover off and there are all kinds of things on there. If you don't even know what a transformer looks like I'm going to suggest you find someone that does. |
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Tstat has been completely replaced, including batteries. It's a carrier unit, any advice on how to confirm what the transformer is? I took the cover off and there are all kinds of things on there. Quoted:
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tformer 24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. This, or check batteries in T stat if it has them, check 3 amp fuse on the board if it has one, make sure blower door is on correctly so door switch is closed. Tstat has been completely replaced, including batteries. It's a carrier unit, any advice on how to confirm what the transformer is? I took the cover off and there are all kinds of things on there. 
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tformer 24v transformer sounds like the winner. Check for voltage at the thermostat. Bad capacitor will not keep entire system from working, nor will low refrigerant,, the air handler will still run. It's either bad thermostat which you've already switched, no power to air handler which may have a breaker on the unit itself, or bad 24v transformer which is in the air handler. Get your multimeter and check for voltage at the air handler, if your good there, open it up and check output of transformer.. That 24v is what powers the contactor on the condenser, and controls the air handler via the thermostat. This, or check batteries in T stat if it has them, check 3 amp fuse on the board if it has one, make sure blower door is on correctly so door switch is closed. Tstat has been completely replaced, including batteries. It's a carrier unit, any advice on how to confirm what the transformer is? I took the cover off and there are all kinds of things on there. http://i62.tinypic.com/2m64iki.jpg Gotcha, thanks! I'll grab a multimeter tomorrow and take a look...I'll update when I do |
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Only educated answer in this thread Quoted:
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Check voltage on the output side of you disconnect and go from there. Only educated answer in this thread Assuming the disconnect referred to is for the condensing unit, regardless of power at this location or not, the air handler/furnace would still run either way. Nothing working,, it's either the transformer as mentioned, thermostat which distributes power from the transformer, or power to the air handler which houses the transformer. Now, if the furnace was working, I'd go straight to the disconnect, but complaint was whole system down. 
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This wasn't my AC unit, it was a neighbors, but they went ahead and called an AC guy this morning. He came out and said it was a fuse, blown likely because of a few things, such as clogged drain line, low on freon and a clogged filter.
I wouldn't think that would blow a fuse, but what are your thoughts? |