AutoFry Troubleshooting (Old Controls)

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AutoFry Troubleshooting Guide

Older Controls (Pre 2008)

For a Troubleshooting Guide on newer control pads, please click here.

Problem Error Code(s) Probable Cause Solution Notes
Not heating / temp. dropping (displaying room temperature) A05 Hi limit tripped Press reset under heater

• Low / dirty oil will cause the hi limit to trip.

• Dirty plugs can disrupt voltage to the heater or cause the hi limit to trip.
Dirty / damaged heater plug connection Clean / replace plugs
Dirty / low oil Filter / change oil
Temperature fluctuation
(temp. fluctuation
of 5-10°F is normal)

A07

A08

PRB

 Low oil level Change / add oil.

• Dirty / greasy plug connections can cause the temp. to fluctuate or give false readings.

• Cleaning the plug connection on a weekly basis with a q-tip and acetone will prevent poor connections.
Dirty / damaged probe plug connection Clean / replace plugs
Overloading basket Be sure not to cook more than your AutoFry models capacity
Not allowing proper recovery time Allow temp. to recover before entering next batch
Basket not dumping
product		 A04 Basket out of adjustment Adjust basket rod

• Go to our youtube page to watch basket adjustment instructional video.

• The basket should sit above the oil pot at a slight angle (2.5-3” above). If the basket is out of position, damage to the gear box will result.
Product sticking to basket Teflon worn, replace basket
Basket cam loose Check / tighten basket cam
Blown secondary fuse Check / replace fuse
Damaged motor / gear box Replace motor assembly
Product going underneath basket A04 Basket out of adjustment Adjust basket rod

• Go to our youtube page to watch basket adjustment instructional video.

• The basket should sit above the oil pot at a slight angle (2.5-3” above). If the basket is out of position, damage to the gear box will result.
Product entered before display shows ready Always wait until display shows ready before opening entry chute
Basket falling out of bracket A04 Basket out of adjustment Adjust basket rod

• Go to our youtube page to watch basket adjustment instructional video.

• The basket should sit above the oil pot at a slight angle (2.5-3” above). If the basket is out of position, damage to the gear box will result.
Basket not fully seated in receiver clip
Opening entry chute before the unit displays ready Always wait until display shows ready before opening entry chute
Outside of AutoFry is hot
to touch		 SFT Charcoal filter still in plastic Remove charcoal filter plastic • Charcoal filter must be changed at least every three months to maintain proper ventilation. Sooner with high volume locations.
Charcoal filter clogged Replace charcoal filter
Exhaust fan blocked or not running Clean / replace fan
Strong odor
from AutoFry		 N/A Charcoal filter clogged Replace charcoal filter

• Cooking oil is the biggest factor in regard to odor. Some oils are much more fragrant than others.

• Charcoal filter must be changed at least every three months to maintain proper ventilation. Sooner with high volume locations.
Exhaust fan blocked or not running Clean / replace fan
Dirty oil Filter / change oil
Excess condensation
on exterior / interior		 SFT Charcoal filter still in plastic Remove charcoal filter plastic

• Fresh products with excess moisture will produce excess condensation.

• Charcoal filter must be changed at least every three months to maintain proper ventilation. Sooner with high volume locations.
Charcoal filter clogged Replace charcoal filter
Exhaust fan blocked / not running Clean / replace fan
Excessive product moisture Reduce ice / moisture in product
Door gasket worn Replace gasket
Excess oil underneath
oil pot		 N/A Drain valve open / blocked Close / clean / replace valve

• Dirty oil is prone to surge boiling.

• Products with excessive ice / moisture can cause oil to boil over.

• Clean the interior regularly.
High oil level Lower oil level
Excessive product moisture Reduce ice / moisture in product
Dirty oil Filter / change oil
Overloading basket Be sure not to cook more than your AutoFry models capacity
Oil pot leaking Replace oil pot
Display blue N/A Excess moisture on display board Remove display and set aside to dry

• Typically caused from poor ventilation.

• Charcoal filter must be changed at least every three months to maintain proper ventilation. Sooner with high volume locations.
Replace charcoal filter
Check / replace silicone seal around display compartment
Poor ribbon cable connection Replace Display
AutoFry won’t turn on N/A Tripped breaker Reset breaker • There are four fuses in the back of the AutoFry. Check all four. If the problem continues contact technical support.
Blown fuses Check / replace fuses
Trace voltage to circuit board
AutoFry shut off in the middle of cook cycle N/A Basket jammed Remove basket, turn on and cycle without basket • If the basket comes out of its normal position and jams, it will likely over Amp, causing the secondary fuses to blow.
Motor / gearbox jammed Check / replace motor assembly
Blown fuses Check / replace fuses
Don’t hear fan running SFT Charcoal filter clogged Replace charcoal filter

• The exhaust fan should run anytime the oil is hot and/or trying to heat.

• The fan will continue to run until the oil cools below 192°F.
Exhaust fan blocked / not running Clean / replace fan
Safety Switch – Front Door SFT Front door open Close door, turn AutoFry off then on again. • All switches are normally open. Switch should be closed for normal operation. Check switch for continuity.
Door gasket worn Check / replace door gasket
Switch gummed with grease Clean Switch of grease
Switch failed Check / replace Switch
Safety Switch – Charcoal Filter SFT Charcoal filter not installed Install charcoal filter • All switches are normally open. Switch should be closed for normal operation. Check switch for continuity.
Charcoal filter dented, not making contact Check / replace charcoal filter
Filter cover plate not tight Tighten filter cover plate
Switch gummed with grease Clean switch of grease
Switch failed Check / replace switch
Safety Switch – Mesh Filter SFT Mesh filter not installed Install mesh filter • All switches are normally open. Switch should be closed for normal operation. Check switch for continuity.
Mesh Filter dented, Not making contact Check / replace mesh filter
Filter cover plate not tight Tighten filter cover plate
Switch gummed with grease Clean switch of grease
Switch failed Check / replace switch
Safety Switch – Grease Baffle SFT Grease baffle not installed Install grease baffle • All switches are normally open. Switch should be closed for normal operation. Check switch for continuity
Grease baffle dented, not making contact Check / replace grease baffle
Filter cover plate not tight Tighten filter cover plate
Switch gummed with grease Clean switch of grease
Switch failed Check / replace switch
Safety Switch – Filter Cover Plate SFT Filter cover plate on backwards Install filter cover plate correctly • All switches are normally open. Switch should be closed for normal operation. Check switch for continuity
Filter cover plate not tight Tighten filter cover plate
Switch gummed with grease Clean switch of grease
Switch failed Check / replace switch
Safety Switch – Fire System SFT Fire System discharged Call fire equipment company for service • Fire suppression system must be serviced every six months by a licensed fire equipment company.
Fire System low pressure
Switch failed
Safety Switch – Fire Damper SFT Fire damper not installed Install fire damper • All switches are normally open. Switch should be closed for normal operation. Check switch for continuity
Fire damper dented, Not making contact Check / replace Fire damper
Switch gummed with grease Clean Switch of grease
Switch has failed Check / replace Switch
Basket hits against side wall N/A This is normal This is normal The basket will hit against the side wall twice to ensure all product has dumped.

Call the MTI Technical Support Line (800-348-2976 x.1112)
for additional troubleshooting advice. If the AutoFry is under warranty, call technical support before servicing.

Call the MTI Technical Support Line (800-348-2976 x.1112)
for additional troubleshooting advice. If the AutoFry is under

warranty, call technical support before servicing.


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