What do Frymaster error codes mean and how is the scheme organised?

Frymaster fryers (FilterQuick, FootPrint Pro, MJ-Series, OCF / BIGLA30-T, and McDonald's-spec models) report faults as E-prefixed numeric codes on M3000 / M4000 and FQ4000 controllers, plain-English words on older 1814 / RE / Pro Series digital controllers (HOT, PROB, HELP, CALL TECH), and lit indicator lights on the simplest analog units. The codes group into three families: thermal safety (E13 RTD probe, E16 software high-limit at 410 °F / 210 °C, E17 mechanical high-limit switch tripped, E18 catastrophic 460 °F+ overheat); gas-side ignition (HELP for ignition lockout); and service / configuration messages (CALL TECH on the M3000 family for problems the operator cannot resolve, plus filtration and oil-quality prompts on FilterQuick and OCF models). Always note the controller type before searching codes — the same E-number on different generations can have slightly different root-cause hierarchies.

What does E17 mean on a Frymaster fryer?

E17 on Frymaster fryers — BIGLA30-T (OCF), FilterQuick, FootPrint Pro — means the bi-metallic high-limit safety switch has opened and cut power to the burner / element circuit. This is a hardware safety device independent of the controller: it trips when vat temperature reaches its rated cut-off, or when the switch itself has failed open. Sequence: (1) let the fryer cool fully — do not attempt to reset hot; (2) press the manual reset button on the high-limit switch (typically on the exterior of the frypot or burner housing) — if it clicks and holds, the switch has reset; (3) if the button will not hold, ohm the switch at ambient — no continuity means the switch has failed open and must be replaced; (4) inspect the high-limit harness back to the SIB board for broken wires, loose spade terminals, or heat-damaged insulation, since an open in this harness presents identically to a tripped switch; (5) if the switch genuinely tripped on overtemperature, diagnose the underlying cause (probe fault, latched heat relay, SIB board) before returning the fryer to service — a repeat E17 with a good switch means an unresolved overheat condition that risks oil-fire.

What does E13 mean on a Frymaster fryer and how do I fix it?

E13 on Frymaster fryers signals a temperature-probe (RTD) fault — the controller is reading the probe outside its valid range and shuts down heating to prevent uncontrolled temperature. Causes: failed RTD element (open or shorted), damaged or oil-soaked probe harness, loose / corroded connector at the controller terminal block, or a probe-input circuit fault on the controller board. Diagnostic flow: (1) power down the fryer and let oil cool to safe handling; (2) reseat the probe connector at the controller, clean any oil contamination with electrical contact cleaner; (3) measure RTD resistance with a multimeter — Frymaster RTD probes read approximately 100 Ω at 32 °F (0 °C) and rise roughly 2 Ω per °F, so room temperature should read in the 113–115 Ω range; (4) zero ohms (short) or infinity / OL (open) confirms probe failure — install an OEM RTD with Loctite PST56765 sealant on the probe fitting to prevent oil leak into the conduit; (5) if the probe tests good but E13 persists, the controller's probe-input circuit has failed and the controller board requires replacement.

What is the difference between E16, E17, and E18 on a Frymaster fryer?

Three escalating thermal-safety faults on the same fryer. E16 is a software high-limit — the controller has detected the RTD reading 410 °F (210 °C) or higher and disabled heating; the mechanical high-limit switch has not yet tripped, and the most likely cause is a stuck latch or heat relay on the SIB board, a contaminated OIB sensor giving a falsely-low reading, or a probe issue masked an overheat. E17 is the hardware level — the bi-metallic high-limit switch has physically opened, cutting burner power independently of the controller; reset the switch after cooling and diagnose what raised vat temperature to the trip point. E18 is the catastrophic case — vat temperature has exceeded 460 °F (238 °C) and the high-limit has failed to open: both the software thermal protection and the hardware switch have been defeated simultaneously. E18 is an emergency — disconnect power immediately, do not drain the oil, allow the frypot to cool passively, and call Frymaster service at 1-800-551-8633 before any further action. After E16 or E18, all oil in the vat is degraded and must be discarded.

What does CALL TECH mean on a Frymaster fryer?

CALL TECH on Frymaster M3000 / M4000 / FQ4000 controllers (BIGLA30-T OCF, FilterQuick, FootPrint Pro) is a generic service-required message — the controller has detected a fault that is outside the operator's authorised troubleshooting scope and locks the affected vat or function until a service technician resolves it. Common triggers: a thermal fault that latched after multiple resets (recurring E16 / E17), a SIB-board self-test failure on power-up, a CAN-bus communication fault between the controller and the SIB / OIB / VIB boards (look for a service-mode error log entry like E60 / E61 / E70), an unrecoverable filtration system fault on FilterQuick, or oil-quality sensor (TPM / FFA) hardware faults on OCF models. Press any key to silence the audible alert; the message itself does not clear until the underlying fault is resolved. Read the controller's service-mode error log first (M3000: enter service mode with code 1656; M4000 / FQ4000: hold the home / settings icon and enter the technician PIN) — the log entry behind the CALL TECH banner is the actual diagnostic starting point. Operating around CALL TECH by power-cycling and ignoring the underlying fault risks fire and voids commercial liability coverage.

What does HOT mean on a Frymaster fryer display?

HOT appears on older Frymaster digital controllers (1814, RE, certain Pro Series boards) and means the controller has detected oil temperature above 410 °F (210 °C) — the same threshold as E16 on newer M3000 / M4000 controllers. Heating shuts off immediately. The oil at this temperature is degraded, smoking or near it, and must be discarded after the unit cools. Sequence: (1) switch the fryer to OFF — do not handle, drain, or filter the oil at this temperature, severe burn risk; (2) keep personnel away from the frypot and let it cool passively; (3) once cooled to a measurable range, compare the controller display against a calibrated thermometer — a more-than-10 °F discrepancy points to a probe or probe-circuit fault; (4) clean the OIB (Oil Information Board) sensor in the frypot — carbon buildup on the sensor causes falsely-low readings that allow the heat circuit to overshoot; (5) inspect the SIB board heat and latch relays — LEDs 1 and 3 on the SIB indicate the relay states, a relay energised when no heat command is issued is stuck closed and the SIB board must be replaced; (6) drain and replace the oil before returning to service. Recurring HOT after cleaning the OIB and verifying the probe means SIB-board work and a service call.

What does PROB mean on a Frymaster fryer and is it the same as E13?

PROB and E13 are functionally equivalent — both indicate the temperature probe (RTD) is reading outside its valid range — but they appear on different controller generations. PROB is the older 1814 / RE / Pro Series digital-controller display; E13 is the equivalent on M3000 / M4000 / FQ4000 controllers. The diagnostic flow is identical: power down, reseat the probe connector, measure RTD resistance (target ~113–115 Ω at room temperature, ~100 Ω at 0 °C, rising ~2 Ω per °F); zero or OL means replace the probe; in-spec probe with persistent PROB means the controller board's probe-input circuit has failed and requires replacement. Apply Loctite PST56765 sealant on the probe fitting when installing a new RTD to prevent oil leak into the conduit. Do not operate the fryer with active PROB — unmonitored oil temperature is a fire hazard.

What does HELP mean on a Frymaster gas fryer and how do I clear an ignition lockout?

HELP on Frymaster gas fryers (FootPrint Pro Pro Series, MJ-Series gas, BIGLA30-T gas variants) means the ignition module has entered lockout after failed trial-for-ignition attempts — the 24 VAC ignition circuit did not establish a flame within the module's window. Diagnostic order, most-common first: (1) drain valve not fully closed — the drain safety microswitch must be closed for 24 VAC to reach the gas valve, push the handle firmly to the stop and verify the switch clicks; (2) gas supply — main shut-off fully open, quick-disconnect fully seated, manifold pressure meets nameplate (typically 3" WC for natural gas); (3) flame-sensing rod — with power off, clean the sensing rod with fine steel wool to remove oxidation that prevents the microamp flame current from reaching the module; (4) high-limit thermostat — verify continuity at ambient temperature, an open high-limit at room temperature blocks 24 VAC and causes HELP on every startup; (5) gas valve coil resistance — Honeywell coils read 400–650 Ω, Robertshaw 71–75 Ω, anything outside the range means a failed coil and gas-valve replacement. Gas-valve replacement and ignition-module diagnostics are licensed work — escalate to a Frymaster-authorised technician (1-800-551-8633) if HELP persists after the operator-level checks.

What controllers do Frymaster fryers use and how do I tell which one I have?

Frymaster has shipped four controller generations across its current and recent product lines. Analog / electromechanical (oldest MJ-Series, simple gas units) — lit indicator lights and a mechanical thermostat, no digital codes. 1814 / RE / Pro Series digital (early-2000s onward, FootPrint Pro Pro Series, J-series gas) — plain-English words on a small LED display: HOT, PROB, HELP, CALL TECH. M3000 (mid-2000s onward, BIGLA30-T OCF, FilterQuick, FootPrint Pro) — alphanumeric LCD with E-prefixed numeric codes (E13, E16, E17, E18) plus service-mode error log accessed via code 1656. M4000 / FQ4000 touchscreen (2018-onward FilterQuick FQE-30 / FQG-30, OCF FilterQuick) — colour touchscreen, same E-code numbering as M3000 but with on-screen guided troubleshooting and a settings-icon technician menu. Identify the controller by looking at the display: a touchscreen is M4000 / FQ4000; a backlit alphanumeric LCD with arrow / down / scroll soft keys is M3000; a small LED with HOT / PROB words is 1814 / RE / Pro Series; lights only is analog. Service literature is keyed to the controller, not the cabinet — always cite the controller generation when calling Frymaster technical service or searching the manual library.

When should I call a Frymaster service technician versus DIY on a fryer fault?

Safe operator-level work on a Frymaster fryer: daily and weekly cleaning, draining and discarding oil after a thermal event, manually resetting an E17 / tripped high-limit switch after the fryer has cooled, replacing the RTD probe (after E13 / PROB confirmed by ohm-test) with the correct OEM part and Loctite PST56765 sealant, cleaning the OIB sensor for HOT / E16 false-low readings, cleaning the flame-sensing rod for HELP, and verifying the drain valve / drain safety switch is fully closed. Call a licensed technician for: any E18 event (catastrophic high-limit failure — disconnect power and call 1-800-551-8633 immediately, do not return to service), recurring E17 with a known-good high-limit switch (unresolved overheat), CALL TECH messages where the service-mode log shows SIB / OIB / VIB board faults, gas-valve replacement and ignition-module work, any 240 V electric-element or contactor work on BIGLA30-T-class fryers, and any repair on a unit still under Welbilt / Frymaster factory warranty — unauthorised work voids coverage and can create commercial-kitchen fire and food-safety liability. Frymaster technical service is reachable at 1-800-551-8633 and fryservice@frymaster.com.

Quick Answer

Frymaster (Welbilt / Ali Group, sister to Pitco) builds US commercial fryers — FilterQuick, FootPrint Pro, MJ-Series, OCF / BIGLA30-T, and McDonald's-spec QSR lines. M3000 / M4000 controllers display E13 (RTD probe), E16 / E17 / E18 (software / hardware / catastrophic high-limit), and HELP (gas ignition lockout); legacy displays show PROB, HOT, and CALL TECH.

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By Nichita Herput

Co-founder & CEO · Reviewed May 2026

What error codes does Frymaster display?

E13

RTD probe reads outside valid range on M3000 / M4000 / FQ4000; ohm probe (~113 Ω at room, ~100 Ω at 0 °C); zero or OL = replace probe with OEM part and Loctite PST56765 sealant.

E16

Software high-limit at 410 °F (210 °C) — stuck latch / heat relay on SIB board, contaminated OIB sensor, or probe under-reading; discard oil after the event.

E17

Mechanical bi-metallic high-limit switch opened independently of controller; manually reset after cooling, replace if no continuity at ambient, then diagnose root overheat.

E18

Catastrophic overheat — vat above 460 °F (238 °C) with high-limit switch failed closed; disconnect power immediately, do not drain, call 1-800-551-8633.

PROB

Legacy 1814 / RE / Pro Series equivalent of E13; same RTD diagnostic flow, ohm probe, replace if open / shorted; persistent PROB with good probe = controller board fault.

HOT

Legacy 1814 / RE display equivalent of E16 — oil above 410 °F; clean OIB sensor, verify probe accuracy, inspect SIB latch / heat relays (LEDs 1 and 3); discard oil.

HELP

Gas-fryer ignition lockout — drain valve / drain microswitch, gas supply pressure, flame-sensing rod oxidation, high-limit at ambient, gas-valve coil resistance (Honeywell 400–650 Ω, Robertshaw 71–75 Ω).

CALL TECH

Generic service-required prompt on M3000 / M4000 / FQ4000; read service-mode error log (M3000 enter code 1656) for the underlying SIB / OIB / VIB / CAN-bus fault.

E15

Filtration / drain-safety related fault on FilterQuick and OCF models — drain handle not fully closed, drain microswitch failed in the open position, or pan-not-installed switch open; verify mechanical position before electrical diagnosis.

E19

Heat-circuit / contactor fault on M3000-class electric BIGLA30-T — SIB board not seeing element current draw despite heat command; check element continuity, contactor coil and main contacts, and 240 V supply phasing.

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