This is the one oven fault a household can settle with a $15 thermometer and a five-minute adjustment: the source's own thresholds are a 10-15 degree tolerance, 25 degrees for recalibration and 50 for a failed part. Calibration drift, which is not a failed part: 10 minutes, no part needed [S1] — the first of 1 causes on this page that need no part at all. On a oven the complaint is the oven cooks unevenly or at the wrong temperature, and it arrives in these words: cookies spread thin and burn at the edges, cakes stay dense and will not rise, roasts finish well before the recipe time, one tray bakes fine and the other burns or everything suddenly takes much longer than it used to. Until that check comes back clean, every price below is premature — the completed repairs behind this symptom run $319–$469 [S2], against a replacement from $700.
What a technician actually does
temperature sensor drift [S2]
medium likelihood advanced $420 installed about 60 minn=19 completed jobs
everything suddenly takes much longer than it used to roasts finish well before the recipe time
The first of the two things calibration cannot fix, and the harder one to see because it fails gradually. A sensor that has drifted reports a temperature that is close enough to look plausible, so the oven cycles on and off more often than it used to and preheating takes longer than it did. S1 puts it in the same bucket as a mechanically failed sensor; S2 prices the repair at $420, which is the second most expensive of the three branches its diagnostic separates.
S2 prices a completed thermostat or temperature sensor replacement at $420 across 19 jobs; no part-only price is published
worn heating element, or a weak bake element [S1]
medium likelihood moderate $319–$322 installed about 60 minn=57 completed jobs
cakes stay dense and will not rise one tray bakes fine and the other burns
An element does not usually fail outright - it weakens, so the oven still reaches temperature but takes longer to get there and recovers slowly after the door opens. That is what makes it look like a calibration problem to a cook and like a sensor problem to a thermometer. S1 lists worn heating elements alongside sensor faults for exactly this reason; the tell is whether the error is consistent across the whole range or only shows up once the oven is loaded.
S2 prices a completed heating element replacement at $319 across 57 jobs and a bake element at $322 across 18, so the two are the same repair by price; no part-only figure is published
gas igniter degrading, so the oven heats weakly [S2]
medium likelihood pro $350 installed about 75 minn=209 completed jobs
everything suddenly takes much longer than it used to cakes stay dense and will not rise
The most replaced component in the source's entire dataset - 209 completed jobs, more than any other part on any appliance it services - and the reason a gas oven bakes unevenly before it stops working: an igniter that has weakened still lights the burner, but it takes longer to do it, so the oven runs behind its own thermostat. Nothing about this is a DIY job. The source's blunt summary of the price is the useful part: a $30 part becomes a $350 invoice, and the part price is never the quote.
S2 prices a completed gas igniter replacement at $350 across 209 jobs, and states that an igniter retailing around $30 arrives at $350 on the invoice once the visit, the gas-safe removal and reinstallation and the warranty are counted
failed control board deciding the wrong thing [S2]
low likelihood pro $469 installed about 90 minn=87 completed jobs
everything suddenly takes much longer than it used to one tray bakes fine and the other burns
The third branch, and the one that makes the source's diagnostic worth paying for: a heat source, a sensor and a board produce an identical complaint from the customer's side, and they are priced $319-350, $420 and $469. The source is explicit that this is the question a visit answers on an oven - is it the thing that makes the heat, the thing that measures it, or the thing that decides when to apply it.
S2 prices a completed control board replacement at $469 across 87 jobs, the dearest of the three branches its diagnostic separates; no part-only figure is published
uneven heat that is not a temperature error at all [S1]
medium likelihood moderate $319–$322 installed about 60 min
one tray bakes fine and the other burns
The variant the source pulls out of the calibration list deliberately: a tray that bakes perfectly next to one that burns is not an oven lying about its temperature, it is heat reaching the two trays differently. Recalibrating that oven moves both trays in the same direction and fixes nothing, which is the most common way a household spends an afternoon on the wrong problem.
no separate figure is published for this; it resolves to the element or fan repair S2 prices at $319-322, or to convection hardware the source does not price
Repair or replace?
Measure before anything is priced: a thermometer at 350F separates a 10-15 degree tolerance from a 25 degree calibration error and from a 50 degree failed part, and the first is free to fix. If the error survives calibration, the repair is one of three things at $319-350, $420 or $469, and the source's own numbers say the cheap end is by far the most common - the heating element and the gas igniter together account for 284 of the 390 priced jobs in its table. Recalibrating an oven with an uneven tray problem fixes nothing, so that variant goes straight to a diagnosis. [S2]
- Typical completed repair: $319–$469 [S2]
- Comparable new unit: $700–$1,500 [S2]
- Planning life used for the decision: 15 years
- The comparison is not the repair against a new oven, it is the repair against the diagnostic: a $99 visit applied to a $319-469 repair is money spent once, while calibrating a failing sensor or element costs nothing and leaves the fault in place. On a built-in wall oven the replacement comparison does not start until the repair passes roughly half of a $700-1,500 unit, which the upper end of the board repair approaches - and only on a machine already past its service life.
the 15-year oven line used across this site's oven guides, combined with S2's own framing that an oven sits in the middle of the appliances it services - about $47 above a dishwasher and $16 below a refrigerator - so a $319-469 repair on a built-in unit is rarely the moment to replace it
Run your own quote through the calculator — the same half-of-new-price rule with your numbers.