The oven in our house is a Jenn-Air model JJW 3830 about 5 years old with a touch screen interface. It recent showed an error: “F2E0 Keypad disconnected. Error enumeration 0x9.” The oven stopped working and said it needed service. It seems that modern appliances have so much delicate electronics they have become less reliable and serviceable.<\/p>\n
I looked it up<\/a> and this thing costs $7,200 ?!?! WTH !?! I couldn’t believe my eyes !?!? For that price, there is no way I’m replacing this thing before I at least try to fix it.<\/p>\n Before diving into the repair I did a little research. A web search on this revealed that the error message indicates a failing panel control and heat damage is common. They last 3-5 years until this problem happens. You can get a replacement board<\/a> for about $800 (parts only – even more if you want Jenn Air to fix it for you) but after a while it will fail again due to heat damage.<\/p>\n After throwing the oven’s dual-pole 40 amp breaker I pulled it out from the wall with the goal of disconnecting and removing the top horizontal display controller. It turns out this was easy to do. A total of 6 screws on the unit, then unplugging 3 wires, and it was sitting on my counter. I’ll call this the “control box”. That wasn’t bad at all, a pleasant surprise, +1 for serviceability.<\/p>\n The safety shutoff thermistor measured 0 ohms, so it wasn’t blown. The root cause lay elsewhere.<\/p>\n When removing the control box, I noticed a vent for hot\/moist oven air that exhausts out the front, left side, above the oven door and below the control box. The control box had been installed incorrectly with the vent inside its bottom edge. Instead of venting out below the control box, it vented directly into the control box! All that hot moist air was venting directly onto the circuit board. Ouch!<\/p>\n I don’t know whether this error was from the factory or from the installer – depends on how the oven is shipped and what assembly is done on site. Either way, it’s a serious mistake and an obvious root cause to the problem.<\/p>\n The circuit board was slightly heat discolored brown right where the exhaust vent hit it. Obvious heat damage, and no visible corrosion but all that moisture didn’t help it. But not melted or blown, and maybe fixable. I unplugged all the connectors on the board, sprayed them with electric contact cleaner, wiped them dry, plugged and unplugged them a few times to scrape off any light corrosion, made sure everything was clean.<\/p>\n Hopefully, this unplugging and cleaning would clear any corrosion that the vent caused and trigger the oven’s logic to reset itself and start working again.<\/p>\n Routing the exhaust vent properly should fix the problem. Yet despite its ridiculous price, where one might expect “price is no object” design, this oven does not have sufficient heat shielding inside between hot vents and its circuit boards. Since the control box board was already compromised, I wanted to ensure it was better protected from further heat damage.<\/p>\n Even when properly routed, the host moist air of the exhaust vents just below the control box. That’s better than venting directly into it, but even so, it will still get the control box toasty warm when the oven is on. Not the best design.<\/p>\n I bought a sheet of heat shielding that consists of a thick yet flexible aluminum reflecting surface with about 1\/4″ thick fiberglass insulation glued to one side. It’s made to wrap car exhausts and protect nearby surfaces from the heat. I cut it to shape with tin snips (the kind made to cut aluminum roof gutters). I installed this shielding in two places:<\/p>\n Note: remember to use PPE like a mask and gloves when cutting & handling fiberglass.<\/p>\n After reassembling, the oven started up and works fine. No more error messages, both top & bottom ovens work. Only time will tell whether this is a permanent fix, but I’ve at least addressed a known design deficiency and postponed a crazy expensive and premature replacement.<\/p>\n","protected":false},"excerpt":{"rendered":" The oven in our house is a Jenn-Air model JJW 3830 about 5 years old with a touch screen interface. It recent showed an error: “F2E0 Keypad disconnected. Error enumeration 0x9.” The oven stopped working and said it needed service. It seems that modern appliances have so much delicate electronics they have become less reliable … Continue reading Fixing the Oven<\/span> Disassembly<\/h3>\n
Cleaning<\/h3>\n
Robustifying<\/h3>\n
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Conclusion<\/h3>\n