Question about Ruud Central System Air Conditioner

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Lawn mower cut control cable going to outside unit. a 3 amp fuse was blown inside air handler. spliced cable togerther, color to color and replaced fuse. air handler will run but compressor does not come on

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Can you take an A.C. voltmeter and see if you have 24v.a.c at contactor on outside unit, if not recheck for same at control board inside to see if the same then you can start isolating the trouble

Posted on Sep 27, 2009

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It's possible that you burnt out the contactor inside the condensing unit.

Posted on Sep 27, 2009

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1 Answer

My husband accidentially cut the thermostat wiring outside when doing yard work. He's wired it back, but the unit will not come back on.


Turn power off to air handler. Inside air handler you should find a small 5 or 3 amp car like fuse either on a control board in inline on the red wire off th he transformer. Replace burnt fuse and turn power back on. Good Luck!!

Apr 17, 2017 | Heating & Cooling

1 Answer

Fans working outside but no air is coming inside, on my 3 ton air conditioner


Check air handler up in attic follow stat to power box on handler look for blown fuse.pull power at unit first

May 22, 2014 | Coleman Propane Forced Air Heater...

1 Answer

Replaced capacitor on fan in air handler now condenser will not run and fan on air handler will not shut off


fan relay stuck in & control fuse might be blown. see if you have 24 volts at outside unit.

Jan 17, 2013 | Gibson Heating & Cooling

1 Answer

Furnice air blows, but my ac unit outside want cut on


if the inside unit is running but the outside unit isn't - I would check the fuses or breaker. I suspect you have a blown fuse or a tripped breaker.
What is also possible is that the 'low voltage' thermostat wire (coming from the thermostat inside the house) has been cut - possibly by a lawn mower or weed eater - or chewed into by a dog.
If this is the case - you easily splice (with all power off) the wires back together using the color of the individual wires.

Jun 06, 2011 | Heating & Cooling

1 Answer

Outside unit won't come on. Drain pas appears dry/.


if nothing comes on (on the outside unit) when you turn on AC (and the inside unit runs ok) I would check the fuses and/or the breaker for the outside unit. I would suspect a fuse blown or a breaker tripped. It's also possible that your 'low voltage' (24V) thermostat wire has been cut (by lawn mower) or chewed into (by dog). If the problem is the low voltage wire you can easily splice it back together - just be sure all power is off.

Jun 06, 2011 | Goodman CKL36AR36 Air Conditioner

1 Answer

I want to find the transformer for the 36 volt inside unit. Is it in the inside unit or outside unit .I have no power to the inside unit however the outside unit has power,and the inside unit appears to be...


It's a 24v transformer. Your indoor unit houses the transformer for the outdoor unit. The outdoor has a low voltage (24v) supply running to it to push in the contactor for the outdoor unit to run. If your air handler inside has no power then it will kill your LOW VOLTAGE power to the outdoor unit. You will still have the high voltage power to the outdoor unit. You may have a fuse on the switch for your air handler blown if there is one. On the disconnect switch mounted to your air handler, you will have a door to open and a fuse in there. If not, check your main breaker at the panel. If you don't know what a transformer looks like, you may want to have someone familiar with electrical of HVAC help you. To check the transformer for power, you first need power to your air handler, which you don't have. I would say that is not your problem. I would assume your air conditioner is not running outside, correct? Your problem is the power (HIGH VOLTAGE) to your air handler. Loose wires, blown fuse, tripped breaker etc...

Aug 06, 2009 | Comfort-Aire HMC36AT-1 Air Conditioner

1 Answer

I have a Ruud air-conditioner/heat pump and it blows 5 amp fuse.


It sounds like the thermostat wire going to the condenser is ground, It either got pulled loose and is touching the housing or as in most cases the wire got cut or was chewed by an animal. You need to turn electric off to both devices and physically inspect the thermostat wire going from the air handler to the outside unit, also inspect where they connect inside the unit. When you find the break, cut and strip each individual wire and securely wire nut each conducter red to red white to white and so on. There you go all fixed. That's when I give you the bill for $75...except this time you write that check to yourself. Good Luck

Jul 14, 2009 | Ruud UBHC Air Conditioner

1 Answer

Where is the fuse box in the inside air handler?


There should be a small 3 or 5 amp fuse on the circuit board inside the air handler.

Apr 19, 2009 | Heating & Cooling

2 Answers

My Goodman Mfg AC unit is blowing fuses on the control board inside the blower/air handler unit. This fuse supplies 24V to the outside compressor unit. Originally, there was a 3 A fuse in it. I replaced it...


Actually you might get a ohm meter the reads to at least 40 megaohms and check the coil on the solenoid valve as well as the coil on the contactor. That would determine which coil ic failing. They should read out above 40 megaohms.

Jul 04, 2008 | Heating & Cooling

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