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AC unit not coming on. Is there a way to rule out the simples like Fuse and breaker box gone bad?

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Yes there is. Take the cover off the electrical part on the outside unit. Locate the contactor grab your volt meter and measure at the two wires coming into it on the bottom. Should read 230 volts ... Now if you got a reading then go to the thermostat and move the switch to cool and go back outside and see if the contactor is engaged if it isn't that is where the problem is. Get back with me and can walk you through it okay? ken

Posted on Jul 11, 2009


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What size breaker should my rv duo-therm a/c run on? Also is the system at all connected to another breaker meaning 2 at the same time ?

20180310_153655-zxo4iinlruydwtqy2qrewtgq-4-0.jpg The dual breaker you mention is called the MAIN, which is where the AC power comes in from the pedestal or shore power. Looking at the picture provided of my unit, you can see there is one AC room each side of the MAIN, which is a 50 Amp that has power going to the left side and right side. Each side will be utilizing one leg of the 120 VAC coming from the pedistal. As you can see, 20 Amp is the size needed.

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AC chronotherm IV plus thermostat has no display and AC has gone off and will not come back on.

Either the 5 amp fuse is blown on the indoor unit, transformer is bad or float switch is tripped.

If you need further help, reach me via phone at

May 28, 2017 | Amana Heating & Cooling

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Daikin split system air con dead

Split system Air conditioners are very often on two or more separate breakers, with a control voltage (24vac commonly) connecting their operation. the condensor unit and out-door fan generally on a 220 vc 'paired' breaker, possibly a quick disconnect near the unit with fuses inside, or an independant breaker pair, and the evaporator unit with INDOOR fan on a 110 or 220 vac breaker.

switch the fan to 'ON' at the thermostat... this is the midpoint of the system electrically. If the fan comes on check for voltage at the condensor unit. a check to see if the thermostat is the problem... remove the thermostat and connect the red, green and either the white or yellow wires (not both) if you chose white you should have heat...yellow AC...

most split system AC have a small buss fuse on the control circuit board of the indoor unit. looks like a glass tube with metal caps held by metal clips. In 40+ yrs experience I have found it is more likely one or both of the 30 amp buss fuses near the outdoor unit (replace both even if one is still ok) or a 30 amp breaker in the quick disconnect box.
In many systems the control voltage to the thermostat derives from a transformer in the outdoor unit... it could be as simple as a broken wire. Without a full diagnostic, a complete description of the unit ( AC or heat pump, etc) this is all speculation

Nov 19, 2013 | Heating & Cooling

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I have a Goodman AC unit that isn't working. I believe its the fuse. My power went out and the ac unit stopped working. the first time the repair guy said it was the fuse. I don't want to spend...

Generally, the fuses are located in a box outside by the outdoor unit. The box has a door on it and you will probably have to pull a cartridge out and the fuses will be behind the cartridge. If you don't have an ohm meter to check the fuses , just go to home depot, lowes or another hardware store where they can check them for you. Be sure to check the circuit breakers too.

Jul 11, 2011 | Goodman CKL36AR36 Air Conditioner

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?-Is it ok to swap wires within fuse box if they amps on the breakers are the same? See details below... Ok, so I have a Sylvania fuse box. Both my A/C unit and my Range run off of thin, dual 40amp...

Yes it is OK, Your gfi's are real sensitive, anything can trip them off, a florescent light will trip them off. Anything not grounded in the circuit will cause it to trip. Take care of that later or don't use it. The 40 amps, I would just forget about the stove for now, get the ac going, cook in the microwave. But swapping the breaker is no big deal. Hope this helps.

Jul 17, 2010 | Sylvania Circuit Breaker - Zinsco/ RC 40...

1 Answer

Goodman ac unit won't come on at all


Apr 20, 2010 | Goodman CLQ36AR49 Air Conditioner

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AC unit had a power surges from the electrical companny and now it only turns on the unit from the breaker panel but no response from the remote control. The fan comes on only when breaker is turn on.

If the outdoor unit does not come on, there is a fuse box mounted on the wall or near the unit. Try changing out the fuses and see if it comes on. Depending on the disconnect box, the fuses are hard to see. You may have to remove a plastic cover to see fuses.Let me know if this is your problem please. Good Luck, Shastalaker7

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Why my ac is on but its not cold

Check the condensing unit (the outdoor section). There are two motors in this unit, a fan and a compressor. If both are not running then you may have a blown fuse or circuit breaker. Fuses are sometimes located in the disconnect box next to the condensor. The circuit breaker is located in your main breaker box. If only one motor is running or neither is running but there are no blown fuses or breakers then you probably have a bad start capacitor. This capacitor should be replaced by a someone knowledgeable in residential 220VAC equipment.

Jan 13, 2009 | Heating & Cooling

4 Answers

Help on my ac unit

no special tricks alyson.....prolly just a breaker or fuse.check the main panel for a turned off breaker and at the unit there's a disconnect box that may have a bad fuse.

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