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Phone: 604-515-6368 (Ext. 2)

Moyer Diebel Repair, Cleaning And Maintenance Manual


Moyer Diebel Limited produces a wide array of dishwashers for the commercial food service industry: automatic bar glasswashers, undercounter dishwashers, door-type dishwashers (standard and high-hood designs), as well as a 44″ and 66″ conveyor dishwasher. It’s no wonder many of our Vancouver clients choose their products because of their accommodating product designs and renowned build quality.

We have compiled a simple “how to” repair, cleaning, and maintenance manual in order to keep your Moyer Diebel appliance in good working condition.

For additional concerns regarding your commercial kitchen appliances contact our service department today!

351HT Canadian-Made, Overflow Type Undercounter Dishwasher


After Each Meal Period Or Every 8 Hours Of Operation

  1. Press the lighted power switch to the OFF position; the power switch light will go out.
  2. Open the door and remove the overflow tube from the wash tank sump.
  3. Inspect and clean the overflow tube rubber seal.
  4. Close the door.
  5. Push and hold the drain switch for 1 second then release.
  6. The dishwasher will drain for 50 seconds and then stop.
  7. Remove the sump filter carefully to keep the soil or waste particles from falling into the sump.
  8. Clean the sump filter by rinsing with clean water. Be sure to back-flush the filter. Do not strike the filter against solid objects.
  9. Check the sump for foreign material and clean as required.
  10. Replace sump filter and the overflow tube.
  11. Make sure spray arms turn freely.
  12. Check the chemical containers and refill as required.
  13. Close the door and turn the ON/OFF switch to ON and return to normal operation mode.

At The End Of The Day

  1. Perform Steps 1-9 on the previous page.
  2. Remove the upper and lower rinse and wash spray arms. The spray arms are interchangeable.
  3. Unscrew the rinse arm pin. Remove the rinse arm assemblies.
  4. Clean the final rinse arm nozzles using a small paper clip.
  5. Remove the rinse arm end plugs if necessary, and flush the rinse arm with clean water.
  6. Re-install the rinse arm end plugs if they were removed.
  7. Remove the wash spray arms and flush with clean water.
  8. Do not use steel wool to clean the interior of the machine.
  9. Contact the chemical supplier for de-liming if required.
  10. Wipe the interior and exterior of the machine with a soft cloth and a mild detergent. Do not hose the exterior of the machine with water.
  11. Reassemble the dishwasher and leave the door open to allow overnight drying.


Minerals accumulate on the interior surfaces of the dishwasher. The deposits have a white haze and, in cases of heavy accumulation, may appear as a granular solid. The generic name for mineral deposits is lime.
  • The removal of lime deposits is called de-liming.
  • Your dishwasher should be de-limed regularly; how often will depend on the mineral content of your water.
  • Inspect your machine interior for lime deposits.
  • If de-liming is required, a de-liming agent should be used for best results in accordance with the chemical supplier’s instructions.


  • Death or serious injury may result when de-liming solution is mixed with sodium hypochlorite (chlorine bleach) sanitizing agent. Mixing may cause hazardous gases to form.
  • De-liming solution and other acids must never be mixed with chlorine, iodine, bromine, or fluorine.


  • Skin contact with de-liming solutions can cause severe irritation and possible chemical burns.
  • Always wear protective clothing and goggles when handling chemicals.


  • Contact your chemical supplier for specific safety procedures and instructions for the use of the de-liming solution supplied for the dishwasher.
  • De-liming solution or other chemicals are not supplied by the dishwasher manufacturer.


Follow The Maintenance Schedules Below To Keep The Dishwasher Operating Most Efficiently

Daily Maintenance

  1. Check the entire wash arm and rinse arm spray jets and clean as necessary.
  2. Make sure the water supply is on and the drain is not clogged.
  3. Check the temperature gauges and/or displays to ensure they are operating.
  4. Make sure dish racks are in good condition.
  5. Check the chemical containers and refill as required.
  6. Follow the cleaning procedures given above.

Weekly Maintenance

  1. Perform Steps 1-5 in the Daily Maintenance.
  2. Inspect water lines for leaks.
  3. Check for water leaks underneath the dishwasher.
  4. Make sure the flexible water fill and drain hoses are not kinked.
  5. Make sure the dishwasher is level.
  6. Clean accumulated lime deposits from the wash tank heating element.
  7. Inspect the scrap screen and replace it if damaged.
  8. Check the spray arms and replace or repair if damaged.
  9. Clean the chemical dispenser pick-up tubing for the detergent and rinse-aid pumps.

To Clean The Pick-Up Tubing

  1. Remove the pick-up tubes from their containers.
  2. Place each tube in a separate container of hot water.
  3. Press and hold the PRIME button up in the DET position until water flows into the wash tank compartment.
  4. Press and hold the PRIME button down in the RINSE position until water flows into the wash tank compartment.
  5. Return the pick-up tubes to their containers.
  6. Run 3 empty dishwasher cycles to flush any chemicals from the dishwasher wash compartment.
  7. Push and hold the chemical prime button to prime the chemical pumps.


Dishwasher stays in wash cycleRinse Sentry extends wash mode to allow final rinse water booster temperature to reach 180℉/82℃Contact Serive Agent because booster thermostat is defective
Dishwasher will not run.Door not Closed Main power OFF Dishwasher OFFClose door completely. Check Breaker on Panel Turn Breaker ON
Low or no water.Main water supply OFF. PRV setting incorrect. Solenoid Strainer clogged. Solenoid valve defective.Open Valve supply. Adjust the PRV setting. Clean Strainer Contact Service agent
Chemicals won’t feed into the dishwasher.Chemical supply low Pick-up tube clogged Supply tubing damaged Supply tubing kinkedRefill chemical container. Clean/replace tube. Replace tubing. Straighten tubing.
Poor wash resultsWares incorrectly loaded in dishrack. Clogged sump filter. Clogged spray arms. Detergent injector not feeding. Thermostat defective. Detergent motor defective. Wash temperature low.Reposition wares or reduce amount of wares. Clean sump filter. Clean spray arms. Replace squeeze tube or clean tubing and pick-up tube. Contact Service Agent. Drain and refill wash tank and run two empty cycles. Contact service agent if problem persists
Water has drained out of the wash tank while the dishwasher was idle.Goose-neck loop in drain hose has been removed. Drain hose clamp is not holding the drain hose in proper position Building plumbing does not provide correct air vent to prevent siphoningRe-route drain hose. DO NOT STRETCH HOSE Replace/adjust hose clamp making sure goose-neck is maintained. Contact Service Agent and/or plumber