Compare ordinary use, not improvised tests
Tell us whether the concern happens with several dishes or one particular cooking setup. Keep notes about the chosen mode, rack position and preheat behavior from normal use. Those details help frame the assessment without proving that the thermostat, element or control is faulty.
Do not try to recalibrate the oven from a single cooking result. Use the exact owner manual for operating guidance, and leave internal measurements and repair decisions to the service assessment.
Explain any surface-cooking concern separately
A range includes more than its oven. If a burner also clicks, a zone fails to heat or a control behaves differently, add that as a separate symptom. Say whether the range is gas, dual fuel or induction if you know.
Stop using equipment that overheats, smokes, sparks or otherwise operates unsafely. A suspected gas leak requires leaving the area and contacting the gas utility or emergency services from a safe location.
Make the appointment useful
For a Murray Hill visit, the person present should be able to describe the cooking issue and identify the affected cavity. If someone else must approve the work, arrange contact in advance. Let the range cool and leave it in place.
Call 212-540-2172 to discuss the appliance, exact address and diagnostic charge. Availability is confirmed with the visit details.
A FEW HELPFUL ANSWERS
Before your service visit
Is a longer preheat automatically a repair problem?
Not from timing alone. Model, mode and operating conditions matter. Explain the change from the appliance's previous behavior so the concern can be evaluated.
Should I run self-clean to improve baking?
Do not use a self-clean cycle as a repair attempt. If the problem began after cleaning, include that history instead of running another cycle.