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Error code · Blakeslee · Conveyor dish machines

Blakeslee Conveyor Dishwasher Error Code C7: Pre-Rinse Pump Tripped

C7 means the thermal protection of the pre-rinse pump has tripped, and rinse results may be affected. The manual says to contact Technical Service. A service technician should check the pump motor.

Medium · inspection needed

Medium: the first station is down, but later stages may still run.

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Code
C7
Maker
Blakeslee
Equipment
Conveyor dish machines
Applies to
Blakeslee rack conveyor with pre-rinse section (PDF is Blakeslee's 'RC64 User Manual'; the RC86 user manual is the same document); prints no model name

What does Blakeslee error code C7 mean?

The pre-rinse pump circulates water over the racks in the first station, and its motor carries a thermal protector that opens when the motor runs too hot or draws too much current. When it trips, the pump stops and the display shows C7 PRE-RINSE PUMP THERMAL PROT. The manual states that the pre-rinse pump thermal protection tripped, that rinse results may be affected, and that the operator should contact Technical Service. A pump can trip for a jammed impeller, a blocked strainer, a worn bearing or a low supply voltage. No reset step is given, because restarting a hot motor without finding the reason can damage it. C7 belongs to the pre-rinse pump. E7 is the wash 1 pump, and U10 the optional motors.

Affected models and control systems

Blakeslee rack conveyor dishwasher with a pre-rinse section. The PDF is Blakeslee's RC64 User Manual, and the RC86 manual is the same document; it prints no model name.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

  • C7 PRE-RINSE PUMP THERMAL PROT. On the display
  • No spray in the first station
  • Pump motor hot or humming
  • Racks leave the first station dirtier than usual

Possible causes

Likely causes — what usually sits behind error code C7 on this control. A technician confirms which one it is before any part is replaced.

  • Pre-rinse pump motor overheated
  • Impeller jammed by debris or scale
  • Strainer blocked so the pump works hard
  • Low or unbalanced supply voltage to the pump

Safe checks before calling for service

✓ What an operator can do
  1. Turn the machine off and let the pump motor cool.
  2. With the machine off, look at the strainers you can reach for debris.
  3. Do not run repeated restarts.
  4. Check racks carefully if you continue.
  5. Note the time of the alarm and any hum or burning smell.

How a technician diagnoses error code C7

  1. Read the alarm history and confirm C7 is active.
  2. Check motor winding resistance and insulation with power locked out.
  3. Test voltage on every phase at the motor during a start.
  4. Inspect the pump for a seized impeller and worn bearing.
  5. Find the cause, reset the protector and replace the failed part.
! Leave this to a technician
  • Pump motors run at line voltage and a hot motor is a burn and shock risk.
  • A seized impeller means opening the pump housing.
  • Phase and insulation tests need a meter.

How error code C7 differs from similar codes

C7 is the pre-rinse pump. E7 is the wash 1 pump, and the M series names the prewash pump in other machines.

Technical reference

Document
Instructions for Use and Maintenance (USA) rack conveyor with pre-rinse section; published on blakesleeinc.com as 'RC64 User Manual'
Maker documentation
Blakeslee owner support
Edition
COD. 4900E_U_USA, Ed. 01 - 02/2018
Models / control
Blakeslee rack conveyor with pre-rinse section (PDF is Blakeslee's 'RC64 User Manual'; the RC86 user manual is the same document); prints no model name
Section
Chapter 12.2.1 Alarms description (pp. 54-55)
Checked
October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.

→Same maker

Related Blakeslee conveyor dish machine error codes

B10Blakeslee Conveyor Dishwasher Error Code B10: Rinse Low TemperatureB2Blakeslee Conveyor Dishwasher Error Code B2: Boiler 1 Probe FailureB3Blakeslee Conveyor Dishwasher Error Code B3: Boiler 1 Heating FailureB5Blakeslee Conveyor Dishwasher Error Code B5: Boiler 1 OvertemperatureC1Blakeslee Conveyor Dishwasher Error Code C1: Pre-Rinse Filling FailureC10Blakeslee Conveyor Dishwasher Error Code C10: Pre-Rinse Temperature AlarmC2Blakeslee Conveyor Dishwasher Error Code C2: Pre-Rinse Probe FailureC3Blakeslee Conveyor Dishwasher Error Code C3: Pre-Rinse Heating FailureC5Blakeslee Conveyor Dishwasher Error Code C5: Pre-Rinse OvertemperatureE1Blakeslee Conveyor Dishwasher Error Code E1: Wash Tanks Filling FailureE2Blakeslee Conveyor Dishwasher Error Code E2: Wash 1 Probe FailureE3Blakeslee Conveyor Dishwasher Error Code E3: Wash 1 Heating Failure
C7Questions about Blakeslee error code C7
Can I keep washing?

Rinse results may be affected, so check each rack.

Is the motor ruined?

Not necessarily. A blocked strainer can cause the same trip.

Will it reset itself?

The protector may close once cool, but the cause remains.

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