Hobart Dishwasher Repair: AM-15, AM-16, and CRS Series Troubleshooting Guide

Hobart dishwashers run the back of the house in commercial kitchens across California. From a single AM-15 door-type at a busy independent restaurant to flight-type FT-series machines in hospitals and corporate cafeterias, these units are designed to handle continuous duty in environments where a clean rack of dishes every few minutes is the difference between service running smoothly and a backup at the bar.

When a Hobart goes down mid-service, the cost climbs fast: stalled tables, manual washing burning labor hours, and the risk of food safety violations from delayed sanitation. If your Hobart commercial dishwasher is failing to fill, drain, sanitize, or cycle properly, call (714) 598-2370. Superior Service is a Hobart factory-certified provider with same-day response across Orange County, Los Angeles, Sacramento, and San Jose.

Hobart Dishwasher Series at a Glance

Hobart's commercial dishwasher lineup covers operations from small cafes to the largest institutional kitchens. The repair patterns differ by series, so identifying which machine you're running is the first step toward an accurate diagnosis.

All Hobart commercial machines share a common subsystem architecture — booster heater, wash and rinse pumps, fill solenoid, drain pump or gravity drain, control board, door switches — but the layout, accessibility, and component sourcing varies significantly between door-type, rack-conveyor, and flight-type units. A technician trained on door-type units alone cannot reliably service an FT-1500 without specific Hobart factory training.

The Five Failures We See Most Often

Across thousands of Hobart service calls in California, five issues account for the majority of unplanned breakdowns. Knowing which one you're facing tells you whether to attempt a basic reset or call for service immediately.

1. Won't Drain at End of Cycle

A Hobart that fills, washes, and rinses normally but won't drain at the end of the cycle is almost always one of these:

• Clogged scrap basket or drain trap. The most common cause and the easiest fix. Pull the scrap basket from inside the wash chamber, clear food debris, and rinse the drain sump.
• Failed drain pump. On AM-series door-type units, the drain pump is a small motorized component under the wash tank. A failed pump shows no continuity when tested. Replacement is straightforward for a Hobart-trained technician.
• Stuck or failed drain solenoid. Some Hobart configurations use a solenoid-driven gravity drain rather than a pump. The solenoid can stick closed due to scale or mineral buildup.
• Control board fault. Less common, but the board may be failing to send the drain signal at the right point in the cycle.

2. Insufficient Rinse Temperature (Below 180°F)

California Retail Food Code requires high-temp dishmachines to deliver final rinse water at 180°F minimum at the manifold for sanitation. A unit that's reading below that on its built-in display — or that gets flagged on a health inspection — almost always has one of three issues:

• Booster heater element failure. The internal element that brings rinse water up to sanitation temperature has burned out or degraded. This is the most common failure on units more than 5 years old.
• Scale buildup on the booster element. Mineral scale insulates the element, reducing heat transfer and stretching cycle times. In Sacramento and inland OC water, this is a routine quarterly issue.
• Failed temperature sensor or thermostat. The sensor is reporting incorrectly to the control board. A technician will test the sensor against a calibrated reference before recommending replacement.

3. Wash Arms or Rinse Arms Not Spinning

Hobart wash and rinse arms spin under hydraulic pressure from the wash and rinse pumps. When they stop spinning, racks come out partially cleaned and rinsed — usually with a clear pattern of clean spots and dirty spots based on where the arms stopped.

• Clogged spray nozzles. Scale, food debris, or bearing wear inside the arm. Each nozzle should be removed and cleaned.
• Worn arm bearing or bushing. The arm wobbles or stops spinning entirely. Bushings are an inexpensive part replaced quickly.
• Reduced pump pressure. The wash or rinse pump impeller is worn, or the pump motor is degrading. Lower output pressure means insufficient torque to spin the arms.

4. Fill Solenoid Stuck Open or Closed

The fill solenoid controls water entry to the wash tank. When it sticks open, the unit overfills and overflows; when it sticks closed, the unit cycles dry. Both are typically caused by scale buildup inside the solenoid valve or sediment in the supply line. The fix is usually solenoid replacement plus inline filter cleaning.

5. Door Switch or Interlock Failure

On door-type AM units, the door switch tells the control board the chamber is sealed and safe to begin the cycle. A failed switch means the unit thinks the door is open and won't start. Diagnosis is straightforward — a technician tests the switch for continuity in both door positions. Replacement is a 15-minute repair on most AM-15 and AM-16 configurations.

California Hard Water and Hobart Service Intervals

Most of California's commercial water service is moderately to severely hard. The mineral load in Sacramento, the San Joaquin Valley, inland Orange County, and parts of the South Bay is hard enough that any commercial dishwasher running without water softening will accumulate measurable scale in 30–90 days.

Scale buildup affects Hobart machines in four ways:

1. Booster heater efficiency loss. Insulation from scale slows water heating, stretching cycle times and pushing rinse temperatures below code.
2. Spray nozzle restriction. Scale narrows nozzle apertures, reducing pressure and cleaning effectiveness.
3. Solenoid sticking. Mineral buildup prevents the plunger from moving freely.
4. Pump impeller wear. Scale particles abrade impellers and seals, shortening pump life.

Operations on a regular descaling schedule see roughly 40–60% fewer breakdowns than those running on a reactive break-fix basis. For most California kitchens, monthly descaling using a Hobart-approved delimer is the right cadence; locations with water softeners can usually stretch to quarterly. Locations connected to a high-quality reverse-osmosis or softener loop can sometimes go six months between full delimers.

Hobart Factory-Certified Service vs. Generic Repair

Hobart-specific training matters more on these units than on most other commercial appliances. The proprietary control boards, the specific torque specifications on the wash pump assemblies, and the OEM-only specification on key parts (door springs, gaskets, wash arm bearings) all favor working with a Hobart-certified provider. A non-certified shop can usually get a unit running again, but they often substitute generic parts that fail in 3–6 months and don't carry the original Hobart parts warranty.

Superior Service is a Hobart factory-certified provider with full access to OEM parts inventory across our California service area. We stock common AM-series and CRS-series parts on the truck for first-visit completion on most service calls. For service-area details, see our California service map; for an overview of our full Hobart service capabilities, see our Hobart equipment repair page.

Repair vs. Replacement: When to Call It

A new AM-15 runs roughly $5,500–$7,500 installed in California. A CRS conveyor is $25,000–$45,000 depending on configuration. Those replacement costs mean repair is almost always the right call unless one of these conditions applies:

• Multiple major failures within a 90-day window on a unit older than 12 years
• Documented motor or control board failure plus chassis corrosion or tank cracking
• Parts unavailability for very old configurations (some pre-2000s AM models are now parts-limited)
• A switch from chemical sanitizing to high-temp (or vice-versa) that would require substantial retrofit anyway

In every other situation, repair is dramatically less expensive than replacement, and a well-maintained Hobart commercial dishwasher delivers 15–20 years of service.

Frequently Asked Questions