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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22517
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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My a/c was running fine yesterday, my husband changed the

Customer Question

My a/c was running fine yesterday, my husband changed the filter in the unit and it stopped working. We checked a few things last night with a HVAC tech with no solution. My husband checked for current coming from the 120v and says there is no power going
to the unit. What should we do next?
Submitted: 1 year ago.
Category: HVAC
Expert:  urelectrician replied 1 year ago.

Hello and welcome to Just Answer. My name is ***** ***** I will be happy to assist you with your electrical question.

1) Is the A/C unit plugged into a dedicated wall mount receptacle circuit or is the circuit shared with other connected loads?

2) If a cord & plug connected A/C unit, did you measure for voltage at the circuit breaker and at the wall receptacle?

3) What were the voltage measurements from Hot to Neutral, Hot to Ground and from Neutral to Ground at the receptacle?

Customer: replied 1 year ago.
This is Rheem unit with condenser outside, no plug or wall receptacle
Expert:  urelectrician replied 1 year ago.

Thanks for the replies.

1) I've never heard of an exterior condenser that has 120 volts, they are always 240 volts.

2) Did you measure for voltage at the exterior disco switch?

3) What is the model number or provide me with the nameplate rating of the A/C unit?

4) How many amps is the circuit breaker that controls the A/C unit?

Customer: replied 1 year ago.
No the inside unit has coil like wire connected to a box that reads 115v heater
Customer: replied 1 year ago.
Then there is one brown wire connected to the unit coming from a box 24v t Stat
Expert:  urelectrician replied 1 year ago.

OK, thanks for the reply.

I will opt out of the question and send it over to one of our HVAC experts and they can better assist you.

No need to reply back to me, as you will be notified once an HVAC expert picks up your question.


Customer: replied 1 year ago.
Ok thanks
Expert:  Mike G. replied 1 year ago.

Hi, I'm Mike G and I'll be glad to assist you. I suggest checking the access panel you removed to change the filter. There is usually a cover switch the tells the unit it is sealed.

Customer: replied 1 year ago.
There is a switch that you can move in and out and hear clicking. There are also three little lights (bulbs), one orange and the other two are green, none of which are lit. If I press the switch in, shouldn't the lights come on?
Expert:  Mike G. replied 1 year ago.

Push and hold it for a test. The cover should depress it and hold it.

Customer: replied 1 year ago.
Correct and it does, but still nothing
Expert:  Mike G. replied 1 year ago.

OK, that's as far as I go. You have other issues that the HVAC expert can assist with. Good luck.

Customer: replied 1 year ago.
ok thanks
Expert:  BillyHvac replied 1 year ago.

Hello, this is Billy.

Are you at your wits end yet?

Ready to try a couple more items?

Customer: replied 1 year ago.
Lol, I was earlier, problem solved. The emergency switch was off this whole time! Flipped it on and a/c running fine!
Expert:  BillyHvac replied 1 year ago.

excellent...that was the first place we were going...

I am very glad you have it it a weekend :)

Customer: replied 1 year ago.
Thanks! You guys are the best!