I got a call last week, for a refrig warmed up. It turned out to be an Amana 5XD23VW. Side by side, freezer on the left. Has an ice maker, but no water dispenser. I also jotted down that it takes 5.125 ounces of R-134A, and it draws 9.48 amps.
The caller says that the fridge has been "fine" until a couple days ago.
Knew I had the right house, cause there were bags of food on the snow, right outside the house when I arrived. The freezer was dripping onto the floor, and both sides were warm.
I pulled the grille off the back, where the condensor blows out. It was maybe 75% blocked. The compressor was running. Warm, but not hot. The discharge line was hot, but not cooking hot.
The condensor coils had considerable dust, and so I vacuumed them out.
Control knobs were set to 5 and 5, out of a possibe 7 being coldest. The owner reports she had not moved the knobs. One controls a cold control, the other has a temp activated damper to blow cold air into hte fridge.
I forced the timer into defrost, and started to take the cover off the evaporator. The evap was about 1/3 frozen, the top third. The defrost heater was running, I could feel the heat. It defrosted, and drained off.
When the defrost cycle was completed, it was several minutes before the evaporator fan came on. A look at the wiring diagram on the back tells me that the evap fan depends on the defrost bimetal (termination thermostat) being open. Cause the evaporator fan grounds through the heater element.
And seeing as how the evaporator was frozen (top third) I replaced the defrost timer. Had one on the truck.
When the evaporator fan came back on, I couldn't feel any cold air coming through the hole at top of the refrigerator. Well, give it some time. I didn't have that part anyway, I don't stock all the available evap fans (or even a couple tinkertoy Gemlines).
So, she called back the next day, still warm. OK, must be the evap fan was weak (this we know, it wasn't moving air). Went out and replaced the evap fan and she noticed how much better the refrig sounded.
And with a sigh of relief, I drive off, and figure this one for good. Write the bill.
Not so fast! She called back again, still not cooling. I'm about ready to tear out what's left of my hair. I've been mentally takign the fridge apart in my mind, and put it all back together. Now, it's time to ask the guy and gals on AHR what might be the problem.
The possible solutions I consider are: Low on freon. (why the evaporator was frosted only on the top third; would also explain the discharge line off the compressor being warm, not cooking hot). Intermittent condensor fan. (When I first looked at the unit, the fan had been blocked for months, but the discharge line off the compressor wasn't cooking hot, and the compressor itself was only lukewarm). Evil gremlins (Should I call a priest?). Ice blockage in the air passageway. (Not likely, the first time I looked at the unit, it was pretty well melted out). Something blocking the airflow to the refrig? (Doubt it, there wasn't any food or anything visible in the entrance to the air duct at top, adn the duct is protected by a plastic cover anyway).
I've got to call the lady back, and probably go out Monday to work on the refrig, again. Anyone seen this before? What to check next?