What does Hobart F3 mean?

F3 is a fuse on the Hobart AM16 control board. When F3 (or F4) opens, the machine loses 120VAC to the control circuitry, causing the display to go dark and all operation to stop.

What does Hobart F1 mean?

F1 is a fuse located on the relay board of the Hobart AM16 dishwasher. When F1 opens, the 24VDC control signal to the built-in chemical pumps is interrupted, stopping detergent, rinse aid, and sanitizer injection entirely.

What does Hobart dishwasher fault code F3 mean and how do I fix it?

F3 (and the closely related F4) is a fuse on the Hobart AM16 control board that protects the 120 VAC supply to the control circuitry. When F3 opens, the display goes completely dark, no buttons respond, and the machine will not fill or wash. The blown fuse is almost always a symptom — not the cause — so simply replacing F3 without finding the underlying short usually pops the new fuse on power-up. Diagnostic flow: confirm line voltage at the supply terminal block, lock out power, remove F3 and F4 and ohm them for continuity, check transformer T1 for 120 VAC output (a shorted T1 will keep blowing fuses), and inspect every wire harness routed to the control board for chafing or pinched insulation. Replace only with the identical-rated fuse stamped on the original. If the new F3 blows again, stop and call Hobart Service — a shorted contactor or control board is likely.

What does Hobart dishwasher fault code F1 mean?

F1 is a fuse on the Hobart AM16 relay board that protects the 24 VDC control signal to the built-in chemical pumps (detergent, rinse aid, sanitizer). When F1 opens, the chemical pumps stop dosing entirely — the machine still washes and rinses mechanically, but ware comes out unclean and unsanitized because no detergent or sanitizer is being injected. Companion chemical-low codes 074, 075, 076, 077, and 079 may also appear on the display because the control no longer sees pump activation. Diagnostic flow: lock out power, ohm F1 for continuity, inspect each chemical pump wiring connector for corrosion (chemical splash causes resistance that pops fuses), measure 24 VDC at power supply PS1, and confirm the machine-type and chemical-pump parameters in the service menu match the installed configuration. If F1 blows again during a manual prime cycle, isolate each pump motor individually — the failed motor is the one that pops the fuse.

How do I read Hobart dishwasher fault codes and where is the fault log?

On AM16 and similar Hobart digital-control dishwashers, fault codes display directly on the machine's HMI (the small screen above the start buttons) when a fault occurs — the code number flashes alongside a brief description. To pull the historical fault log, enter the Manager Menu by holding the menu button for the documented duration (typically 3–5 seconds, per the AM16 Customer Support Manual page 66 service menu procedure) and navigate to the error history. Older Hobart machines without a digital display use status lamps and a binder-pocket service decal on the inside of the front panel that maps lamp patterns to fault categories. For machines with no HMI at all, fault diagnosis works backward from observable symptoms (no fill, no drain, no heat) using the Customer Support Manual's symptom-to-component table. Photographing the live error code is recommended before clearing it — once a power cycle clears the display, the technician on the next call has nothing to work from.

How do I reset a Hobart dishwasher after a fault code?

Most Hobart fault codes clear with a controlled power cycle once the underlying cause is fixed. Procedure: press the power button for 5 seconds (this drains the wash tank and shuts the machine down cleanly — do not yank the disconnect with a full hot tank), wait 10 seconds, and turn power back on. The machine should re-fill, heat, and return to READY. Latched-safety faults are different: a thermal cutout on the booster heater requires a manual reset button push at the heater itself after the water cools, and a blown F1 or F3 fuse requires physical fuse replacement before the machine will operate. Persistent fault codes that return immediately after reset point to an active hardware fault — do not loop the reset more than twice; lock out power and run the diagnostic flow for that specific code, or call Hobart-authorized service.

Where can I find the Hobart AM16 dishwasher manual chart of error codes?

The full Hobart AM16 error-code chart is in the AM16 Customer Support Manual (Hobart document F41339, 09/25 revision) — not the operator manual. The Customer Support Manual is distributed to authorized Hobart dealers and service partners; a redacted public copy is also hosted on WebstaurantStore at the AM16 series dishwashers customer support manual PDF link. The chart maps every E-prefixed code (tank-fill, drain, temperature, sanitizer concentration), every F-prefixed fuse callout (F1 relay-board chemical-pump fuse, F3/F4 control-board main fuses), and every chemical-low alert (074–079 series) to the affected component, the recommended diagnostic step, and the wiring-diagram reference. AskWhiz on WhatsApp surfaces the same chart contextually — type the model and the code and you get the chart row for your specific machine without paging through a 200-plus page PDF.

Quick Answer

Hobart commercial dishwashers (AM-15, AM16, AM16VL ventless, CLeN / CL44eN conveyor) display F-prefixed codes for blown control-board fuses (F1 chemical-pump circuit, F3/F4 main 120 VAC supply), E-prefixed codes for tank-fill, drain, and temperature faults, and PUMPDRN as the normal pump-drain status. Hobart also makes mixers and slicers, but the GSC search intent on "hobart fault codes" is dishwasher-driven.

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By Nichita Herput

Co-founder & CEO · Reviewed May 2026

What error codes does Hobart display?

or F4 on control board open. No display. 1. No power to the machine. Fuse blown

on relay board open. 2. Loose connection(s)at chemical pump(s). 3. Chemical pump

Common questions about Hobart equipment

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