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PizzaHQ

Pizza troubleshooter

Choose what you saw — up to three things — and, if you know them, what you baked on, the style and the bake. PizzaHQ ranks the likely causes from its 57 documented symptoms, 137 recorded causes and 36 equipment-specific branches, and for each one says why it fits, how to tell it apart from its neighbours, what you can still rescue, and what to change next time.

2. What did you see? Choose up to 3.

1 of 3 chosen.

3. Context (optional — sharpens the ranking)

Ranked causes

Most likely

  1. The oven or appliance was not fully up to temperature when the timer started

    Generally accepted

    Bake environment · from The middle is still cold or frozen after the full time

    Pack times assume the oven has finished preheating. A pizza that goes into a still-heating oven spends the first part of its time warming up rather than cooking, and the centre — the furthest point from every hot surface — is what runs out of time.

    Why it fits
    • Recorded cause of "The middle is still cold or frozen after the full time", ranked 1 of 5 by PizzaHQ's editors.
    How to tell it apart
    The pizza went in before the oven finished preheating (or the timer started with the oven), and the top and edges also look paler than expected.
    Rescue it now
    Put it back in the fully preheated oven, on the shelf or surface the pack names, and keep going in short stretches until the middle is steaming hot throughout; cover any edges that are already dark loosely with foil. A food thermometer pushed into the centre is a more reliable check than colour on top — see the food-safety note
    Next time
    Follow the pack's appliance, setting and shelf position, wait until the oven has finished preheating before starting the timer, remove every piece of packaging, cook one pizza at a time, and add extra toppings sparingly and not straight from the fridge. When reheating in a microwave, follow its standing time and check the middle before eating

    The middle is still cold or frozen after the full timePizza in a domestic ovenPizza on a baking tray

  2. A setting, appliance or surface different from what the pack's times were written for

    Generally accepted

    Equipment · from The middle is still cold or frozen after the full time

    Instructions are written for particular appliances and settings. A conventional setting where the pack assumes fan, a tray where it says directly on the shelf, or an air fryer or microwave the pack does not list can all leave the centre behind the stated time.

    Why it fits
    • Recorded cause of "The middle is still cold or frozen after the full time", ranked 2 of 5 by PizzaHQ's editors.
    How to tell it apart
    The edges and top look done, but the pizza was cooked on a tray, a different setting, or in an appliance the pack does not name.
    Rescue it now
    Put it back in the fully preheated oven, on the shelf or surface the pack names, and keep going in short stretches until the middle is steaming hot throughout; cover any edges that are already dark loosely with foil. A food thermometer pushed into the centre is a more reliable check than colour on top — see the food-safety note
    Next time
    Follow the pack's appliance, setting and shelf position, wait until the oven has finished preheating before starting the timer, remove every piece of packaging, cook one pizza at a time, and add extra toppings sparingly and not straight from the fridge. When reheating in a microwave, follow its standing time and check the middle before eating

    The middle is still cold or frozen after the full timePizza in a domestic ovenPizza on a baking tray

Also possible

  1. Packaging left underneath, or extra cold toppings added on top

    Generally accepted

    Workflow and timing · from The middle is still cold or frozen after the full time

    A card disc or film under the pizza insulates the base from the heat, and a layer of extra fridge-cold cheese or toppings both insulates and adds cold mass to the centre the pack's time never allowed for.

    Why it fits
    • Recorded cause of "The middle is still cold or frozen after the full time", ranked 3 of 5 by PizzaHQ's editors.
    How to tell it apart
    A card disc or film was still under the pizza, or a generous extra layer of fridge-cold topping went on the middle.
    Rescue it now
    Put it back in the fully preheated oven, on the shelf or surface the pack names, and keep going in short stretches until the middle is steaming hot throughout; cover any edges that are already dark loosely with foil. A food thermometer pushed into the centre is a more reliable check than colour on top — see the food-safety note
    Next time
    Follow the pack's appliance, setting and shelf position, wait until the oven has finished preheating before starting the timer, remove every piece of packaging, cook one pizza at a time, and add extra toppings sparingly and not straight from the fridge. When reheating in a microwave, follow its standing time and check the middle before eating

    The middle is still cold or frozen after the full timePizza in a domestic ovenPizza on a baking tray

  2. More than one pizza in the oven at once

    Generally accepted

    Workflow and timing · from The middle is still cold or frozen after the full time

    Two pizzas take more heat out of the oven than one, and one usually sits on a shelf shaded by the other, so at least one runs behind the pack's single-pizza time.

    Why it fits
    • Recorded cause of "The middle is still cold or frozen after the full time", ranked 4 of 5 by PizzaHQ's editors.
    How to tell it apart
    Two pizzas went in together, and the cold centre is on the lower or shaded one (or both are behind).
    Rescue it now
    Put it back in the fully preheated oven, on the shelf or surface the pack names, and keep going in short stretches until the middle is steaming hot throughout; cover any edges that are already dark loosely with foil. A food thermometer pushed into the centre is a more reliable check than colour on top — see the food-safety note
    Next time
    Follow the pack's appliance, setting and shelf position, wait until the oven has finished preheating before starting the timer, remove every piece of packaging, cook one pizza at a time, and add extra toppings sparingly and not straight from the fridge. When reheating in a microwave, follow its standing time and check the middle before eating

    The middle is still cold or frozen after the full timePizza in a domestic ovenPizza on a baking tray

  3. Uneven microwave heating when reheating

    Generally accepted

    Equipment · from The middle is still cold or frozen after the full time

    Microwaves heat unevenly and leave cold spots, often in the middle of a dense or thick piece; the edges can be very hot while the centre is still cold.

    Why it fits
    • Recorded cause of "The middle is still cold or frozen after the full time", ranked 5 of 5 by PizzaHQ's editors.
    How to tell it apart
    The pizza was reheated in a microwave, and the crust edges are hot or tough while the middle is still cool.
    Rescue it now
    Put it back in the fully preheated oven, on the shelf or surface the pack names, and keep going in short stretches until the middle is steaming hot throughout; cover any edges that are already dark loosely with foil. A food thermometer pushed into the centre is a more reliable check than colour on top — see the food-safety note
    Next time
    Follow the pack's appliance, setting and shelf position, wait until the oven has finished preheating before starting the timer, remove every piece of packaging, cook one pizza at a time, and add extra toppings sparingly and not straight from the fridge. When reheating in a microwave, follow its standing time and check the middle before eating

    The middle is still cold or frozen after the full timePizza in a domestic ovenPizza on a baking tray

  4. The pack's times were written for the appliances it names. In a small, fast air fryer the outside browns quickly and looks finished well before heat has reached the middle of a frozen pizza, so judging by colour leaves the centre behind.

    Strongly supported

    Equipment · Pizza in an air fryer · from The middle is still cold or frozen after the full time

    Why it fits
    • Applies only if you are using "Pizza in an air fryer".
    How to tell it apart
    A frozen or take-and-bake pizza went in the air fryer, the outside looks done or dark, and the middle is still cold — and the pack gives no air-fryer instructions.
    Rescue it now
    Lower the temperature and keep cooking until the middle is steaming hot throughout, or finish it in a preheated oven following the pack; see the food-safety note on this symptom.
    Next time
    Use the air fryer only for pizzas whose pack gives air-fryer instructions, follow them, and check the middle with a food thermometer rather than by colour.

    The middle is still cold or frozen after the full timePizza in an air fryer

  5. A cold tray absorbs heat from the base at the start of the bake and shields it from the oven's bottom heat, so a pizza timed for the bare shelf finishes its time with the middle still cold.

    Generally accepted

    Equipment · Pizza on a baking tray · from The middle is still cold or frozen after the full time

    Why it fits
    • Applies only if you are using "Pizza on a baking tray".
    How to tell it apart
    The pack said to bake directly on the oven shelf, but the pizza went on a cold baking tray, and its base is pale as well as the centre cold.
    Rescue it now
    Slide the pizza off the tray directly onto the oven shelf and continue until the centre is steaming hot throughout.
    Next time
    Follow the pack: if it says directly on the shelf, put it on the shelf (a tray on the shelf below can catch drips); if it says a tray, preheat the tray with the oven.

    The middle is still cold or frozen after the full timePizza on a baking tray

  6. Pack times assume a fully preheated oven at the stated setting. A domestic oven's air reaches temperature before its walls and shelves do, and conventional (no-fan) settings heat food more slowly than fan settings at the same number, so the centre runs behind the stated time.

    Generally accepted

    Bake environment · Pizza in a domestic oven · from The middle is still cold or frozen after the full time

    Why it fits
    • Applies only if you are using "Pizza in a domestic oven".
    How to tell it apart
    The pizza went in as soon as the oven was switched on or when the preheat light first went off, or on a conventional setting where the pack gives a fan temperature.
    Rescue it now
    Return it to the oven at the pack's setting and keep going in short stretches until the centre is steaming hot throughout, covering dark edges loosely with foil.
    Next time
    Let the oven run for several minutes beyond the preheat light, start the timer only then, and use the setting the pack's temperature refers to (fan or conventional); check from the earliest time given and go on until the centre is hot.

    The middle is still cold or frozen after the full timePizza in a domestic oven

How this works

Every cause shown is one PizzaHQ has already documented, either on a symptom page or as an equipment-specific branch. The troubleshooter does not invent causes; it ranks the documented ones against what you told it.

A cause starts from its recorded evidence confidence and its editorial rank within its symptom. An equipment-specific cause for the equipment you used rises sharply, and causes for equipment you are not using are set aside. A kind of cause (bake environment, fermentation, toppings…) that also explains another thing you saw rises again — one explanation for two observations is more likely than two separate faults.

If you name a style, its recorded equipment fit, bake temperature and bake time are compared with yours; a bake far outside the style's range, or equipment PizzaHQ records as a compromise for that style, raises the heat and equipment causes and says why.

Assumptions

  • Causes are bucketed — most likely, also possible, less likely — rather than given a percentage; the underlying ranking is additive and every addition is listed under 'Why it fits'.
  • 'How to tell it apart' is the observation PizzaHQ records as distinguishing that cause from the symptom's others.
  • Bake temperature and time only count when a style is chosen, because they are judged against that style's recorded range.

Limitations

  • Only documented symptoms can be diagnosed. If what you see is not listed, the closest symptom page is the better starting point.
  • Equipment-specific branches exist where equipment genuinely changes the answer; most dough-stage problems have none, by design.
  • A ranking is a starting point for checking, not a verdict — the distinguishing observations are there so you can confirm or rule out each cause yourself.

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