Amana Oven Won't Turn Off: Cut the Power First

First, Make It Safe#

An oven that will not turn off is a fire hazard, so kill the circuit breaker immediately. For gas models, also close the gas supply valve. That removes the danger and gives you a safe machine to diagnose. Most likely, the cause is a control-board relay that has welded shut and is holding the heating element energized, or on a gas range a control knob physically stuck off its Off position. A shorted temperature sensor telling the board to keep heating is the third possibility. Amana ovens share the Whirlpool control platform, so the same three causes apply across models like the gas AGR5330BAS and the electric AER6303MFS.

Cause-by-Symptom Table#

Why the Relay Welds#

On electric Amana ovens, the control board switches the heating element through a relay, and a power surge can weld that relay's contacts closed. Once welded, the relay passes current to the element no matter what the board commands, so the oven keeps heating even when you press Off — which is exactly why the panel may look dead or unresponsive while the element stays hot. This is the most common version of the fault, and it is why the board is the part that gets replaced. A surge protector on the circuit is the simplest way to prevent a repeat once it is fixed.

The Sensor and the Knob#

A shorted temperature sensor (WPW10181986) is the subtler electric-side cause: it reports the wrong temperature to the board, which then keeps calling for heat trying to reach a target it thinks it has not met. It is an inexpensive part and testable with a meter. On gas ranges, the cause is usually mechanical — a control knob and valve stem that no longer return to the Off detent, so gas keeps flowing to the burner even though you turned it. Check whether the knob feels stuck or loose on its stem; a worn valve or a knob that has slipped is the culprit, and it is a modest repair.

Electric or Gas Narrows It Fast#

Which platform you own cuts the diagnosis in half. On an electric Amana oven the answer is almost always the welded relay or the sensor, and behavior tells them apart: a welded relay keeps the element hot with an unresponsive panel, while a shorted sensor makes the oven overshoot the temperature you set. On a gas range the cause is the knob-and-valve, and it is obvious the moment you feel the stem stick. Because the board and sensor sit on the same Whirlpool platform, a technician tests both quickly — but do not try to reset your way out of a welded relay, because the contacts are physically fused and only a new board clears them.

Preventing a Repeat#

Since a power surge is what welds the relay in the first place, prevention starts at the outlet: fit a surge protector rated for the oven's circuit so the next spike does not fuse the contacts again. Beyond that, ordinary oven upkeep reduces the heat stress that ages the board and sensor — wipe up spills promptly before they carbonize and smoke, and inspect the door gasket once a year, because a worn gasket leaks heat and drives temperature swings that make the electronics work harder. None of this rescues a relay that is already welded, but on the replacement board it is what keeps the same failure from returning, and it is cheap insurance next to another control-board repair.

Repair or Replace?#

An oven that will not shut off is worth repairing on any unit under about 8 to 10 years old — the temperature sensor and gas valve are inexpensive, and even the control board costs far less than a new range. The point here is safety, not economics: do not run the oven until the fault is fixed, and keep the breaker off in the meantime. To prevent related trouble, wipe up spills promptly so they do not carbonize, and check the door gasket yearly for heat leaks. When the board or sensor needs replacing, book an Amana oven repair and leave the power off until it is done.