Service manual

“Why does the circuit breaker keep tripping after the machine runs for a while?”

Circuit breakers become weaker as they are repeatedly tripped or if they are hit by an unusually strong short.

Consequently, a breaker can begin ‘nuisance tripping’ and should be replaced.

Another cause can be a motor or heater that is getting ready to fail.

Wires that have melted and allow current carrying load to come close to the neutral or other phase will trip

a breaker. (To verify, take the wires out and separate them. If they are stuck together that means they have

melted and should be replaced.) When copper burns, microscopically the metal becomes porous and has

more resistance than solid wire—and will burn again.

“Why does the circuit breaker trip as soon as I turn on the machine?”

This usually indicates a serious short, a grounded circuit, or a crossed phase. For a 60 amp breaker to trip

so violently would indicate a powerful contact such as a grounded motor or solid connection to neutral has

occurred.

“Machine runs on all the time, why?”

HT-25: Lift the door to see if it will stop. If it does NOT stop, the problem is a faulty door switch. If it does

stop, the problem is likely the ‘Auto-start” relay. You can test by removing the yellow wire for terminal #1 and

run a cycle. If the machine turns off normally at the end of the cycle, the problem is a faulty relay and should

be replaced (P/N 091-3059). A failed “start” push button, de-lime switch, or the master (on/off) switch on the

cam timer can also cause this problem.

CONVEYORS: If the machine continues to run after racks have exited the machine, the likely cause is a

stuck or failed tray-track REED SWITCH. These are located just outside and under the wash and rinse

tanks. The magnet that is attached to the tray track and is suspended from the front rail hangs directly over

each reed switch. The switch is “normally closed” and the magnet’s inﬂ uence is the only thing that will turn

off the conveyor and pumps.

ADS provides wire diagrams on the various models for troubleshooting electrical problems. Go to

www.americandish.com to download technical and electrical diagrams.

Category 2. MACHINE FUNCTION ISSUES

PUMP PROBLEMS

“Why is the pump ﬁ lter being clogged with string ﬁ ber?”

Historically string ﬁ ber in the pump ﬁ lter comes from washing mop heads and bus towels in the dishwasher.

However, this practice introduces ﬂ oor bacteria to the internal parts of the machine and is difﬁ cult to remove

with out complete disassembly. These kinds of bacteria and soils cause sickness and can be deposited on

clean ware. Operators should be warned to not use the dishwasher in this way. It also creates mechanical

problems in manifold, seals and spray arm systems.

“The pumped rinse sprays are only coming up 6” on the bottom and not rinsing the inside of the glasses?”