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Frymaster · Symptom Guide

Frymaster Says "Service Required, ATO Board"

The auto top-off board tracks oil level and tells the pump when to add oil. When the controller flags it, one vat's board has failed or lost communication. This is a real case from our own service history.

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The Facts

Fryer ATO Board Message

What It Usually Is

  • ATO board on the flagged vat failed. Confirmed by testing each vat in turn and comparing which one drops out.
  • Loose or corroded connector on the ATO board harness, which shows the same message.
  • A low-oil condition that the board is reporting correctly, when the jug is empty or the top-off pump is not moving oil.

Check This First

  • Which vat number is flagged? The message names it.
  • Is the oil jug full and the top-off line clear?
  • Does the fault follow the vat, or move when the controller is power cycled?

When To Call

  • The message returns after a power cycle.
  • The vat will not hold oil level or the top-off pump runs constantly.

What the Repair Usually Costs

An ATO board replacement is a mid-range fryer repair: the board plus the visit. Ranges from our own invoices are on the fryer repair cost page.

The diagnostic visit turns that range into a number for your unit, and you approve the number before any repair happens.

Two Dirty Works technicians servicing a commercial fryer
Frymaster

Need the Documents Today?

Text 601-337-1069 with the certificate holder's legal name and address, or email the vendor form. The W-9 and certificate of insurance come back the same business day.

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Common Questions

Fryer ATO Board Message FAQ

Where is the ATO board?

Behind the oil jug, in the silver electrical box. Each vat has its own, so the flagged vat tells you which board.

Can the fryer run without it?

The vat heats, but the top-off system for that vat will not work and the message stays. Most operators want it fixed before the weekend.

Do you diagnose over the phone with the manufacturer?

When it helps, yes. On this case we tested each vat with Frymaster's technical line on the phone and confirmed the board before ordering it.

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