Get Answers to your Appliance Repair Questions

Disclosure: This website contains affiliate links, Meaning I get a commission if you decide to make a purchase through my links, at no cost to you.

Washer Parts  ·   Dryer Parts  ·   Refrigerator Parts  ·   Dishwasher Parts  ·   Range/Cooktop/Oven Parts  ·   All Appliance Parts 

Author Topic: Rheem A/C not turning on, burning smell  (Read 2500 times)

Offline LowSL2

  • Technician
  • Member Since: Dec 2011
  • Posts: 1244
  • Country: us
  • My cuss. A LOT.
    • Buy me a beer through paypal
Rheem A/C not turning on, burning smell
« on: April 28, 2015, 12:38:31 AM »

I have no idea what I'm doing.

I have a 1975 Rheem furnace model number 3204-80J0. It was 92 today, so I clicked the a/c on and the outside unit didn't turn on. The fan came on high speed as usual inside. So I went outside to check the unit and the fuses were good. Getting 240v to the contactor (?). So I went inside to investigate and there was a burning smell coming from the furnace. I killed power to it and pulled the panels off to find a transformer on the left side super hot. I'm guessing it's a step down transformer? Is this thing replaceable? I can't find a worrying diagram anywhere so I'm lost. Any help would be appreciated.

LowSL2
18+ Years of Professional Appliance Repair Experience
Former $ears/a$e tech

Offline rabjr01

  • Technician
  • Member Since: Nov 2014
  • Posts: 16
  • Country: us
Re: Rheem A/C not turning on, burning smell
« Reply #1 on: May 07, 2015, 04:08:17 PM »
Low yes step down 110v-24v  I would guess a high resistance short in the control wiring to the compressor contactor. disconnect 24v wires at both ends and check for continuity

Offline LowSL2

  • Technician
  • Member Since: Dec 2011
  • Posts: 1244
  • Country: us
  • My cuss. A LOT.
    • Buy me a beer through paypal
Re: Rheem A/C not turning on, burning smell
« Reply #2 on: May 08, 2015, 08:19:54 AM »
I forgot to update this.... I had a friend thats worked on HVAC come over and he said what you said. I replaced the fan control which includes relay and transformer. Found out after I installed the new one that the contactor on the outside condensing unit is fried (0 ohms across coil). So I have that on order and will be replacing it today.

Thanks for the help! :)
LowSL2
18+ Years of Professional Appliance Repair Experience
Former $ears/a$e tech