Every other year, it seems like I’m working on my air conditioner. It’s less than twenty years old by a handful of years, so you’d think it’d be fine. But the truth is, pieces on it regularly fail. The first year of failure, a service guy told me what failed and why, and added, “Parts are made to fail anymore. They have a short life.” He didn’t know if companies were cheaping out on materials or making deliberate choices to reduce parts life to generate more business. He and I agreed, it was probably both. Since I was skeptical of his claims, I researched his assertions on the net and found there’s growing supporting evidence for them.
That aside, I began teaching myself DIY stuff via videos and forums. Replacing the garbage disposal, fixing toilets, sinks, and sprinkler systems, repairing the furnace and air conditioner, whatever came up, I sucked up a deep breath and muttered, “Charge.” Fortunately, the net is full of advice and instructions. Some of it is shit, but there are some solid, helpful sites.
It looks like the air conditioner is in the batting box again in 2024. I flicked it on the other day and…nothing. The usual first steps of settings, circuit breakers, and switches were checked. All good.
I went right out, removed the air conditioner’s service panel, and then the little protective cover on the starter, and pushed in the plunger with a screwdriver. The A/C roared on. Good, it’s getting two forty. Good. A multimeter showed, yes, there is 240v coming to it, but hey, no 24 volt power. Ah.
Back to the thermostat. I pulled the cover off and checked the batteries. Then I checked voltage on the red (power) line and yellow (AC). Nothing. Ah. Must be up in the furnace.
The furnace is in the ‘attic’ crawlspace, a vertical unit sitting on its side above the garage. I laddered up there into the heat. 89 F outside, it felt like it was the upper nineties up there. My body turned on my sweat like I was watering a garden
I turned off the furnace at the switch on the wall and pulled the panels. Safety switch looked good. No loose wires. But also, no blinking diagnostic light on the control panel. The control panel didn’t seem to be getting energy. I checked the little five-amp fuse: intact. Okay.
Power was put back on and the panel safety switch was taped down. I used the multimeter to check voltage on the black L1 power line in and a neutral. No power. For grins and giggles, I also checked the 24v power line and found no power, kind of as expected. Tracing the L1, I realized that in my system, it doesn’t come directly in from the safety switch; the line goes to the stepdown transformer.
As it’s a dark, cramped space, I took a photo of the transformer with my phone so I could study it. When I did, I immediately spotted what looked like damage from aging. Deciding WTH, I went down to the computer, found the piece online, and ordered it.
A heat wave is coming. Upper nineties tomorrow, 106 to 112 F here in Ashlandia on the fourth, and like degrees on the fifth and sixth. The part is due in anytime between the third and the eighth. Hope it gets in on the third but…not holding my breath on that.
Also, hope it is the transformer, because it’s an inexpensive part and an easy fix. If it ain’t the transformer, it’s either the wiring going through the house (which really doesn’t make sense) or the controller board. The board is more expensive and more involved to replace. I don’t want to do that but…if I must…
As stated, I so hope it’s the transformer. Fingers. Fucking. Crossed.
Michael Seidel, writer 