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Error code · Blakeslee · Conveyor dish machines

Blakeslee Conveyor Dishwasher Error Code C2: Pre-Rinse Probe Failure

C2 PRE-RINSE PROBE FAILURE means the pre-rinse probe has failed and the rated temperature cannot be reached. The manual says to suspend washing and contact Technical Service. A service technician should test the probe.

Medium · inspection needed

High: the pre-rinse temperature cannot be confirmed, so washing is suspended.

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Code
C2
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 C2 mean?

The pre-rinse section is heated, and the control relies on a probe in it to read the water temperature. If the probe signal is lost or does not make sense, the control cannot confirm the temperature and shows C2 PRE-RINSE PROBE FAILURE. The manual adds that the rated temperature cannot be reached, which is the practical effect: without a usable reading, the control cannot bring the pre-rinse to its rated temperature or prove that it got there. The instruction is to suspend washing and contact Technical Service. Since the alarm names the probe, the heater may be perfectly healthy. It differs from C3, where the pre-rinse is not heating, and from C5, where it is too hot. On a machine that runs continuously through a shift, a station without temperature control means racks should not be sent through.

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

  • C2 PRE-RINSE PROBE FAILURE on the display
  • Pre-rinse water temperature unknown
  • Rated temperature not reached
  • Alarm returns after restart

Possible causes

Likely causes — what usually sits behind error code C2 on this control. A technician confirms which one it is before any part is replaced.

  • Pre-rinse probe open or shorted
  • Probe lead damaged or pinched
  • Probe connector corroded by steam
  • Control input not reading the probe

Safe checks before calling for service

✓ What an operator can do
  1. Suspend washing, as the manual says.
  2. Turn the machine off and on once to see whether C2 stays.
  3. Do not send racks through while the temperature cannot be confirmed.
  4. Keep clear of the heated tank.
  5. Note the display and when the alarm began.

How a technician diagnoses error code C2

  1. Read the alarm history and confirm C2 is active.
  2. Measure the probe resistance at its connector with power locked out and compare it with the tank temperature.
  3. Inspect the lead and connector for heat, moisture and damage.
  4. Substitute a known resistance at the control input.
  5. Replace the probe, lead or board according to the result, then verify the pre-rinse reaches temperature.
! Leave this to a technician
  • The probe sits in a hot tank near wiring.
  • Its connector is reached through panels at line voltage.
  • Separating a failed probe from a failed input takes a meter and a reference resistance.

How error code C2 differs from similar codes

C2 is the pre-rinse probe. B2 is the same kind of alarm for boiler 1, and E2 for wash tank 1.

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 AlarmC3Blakeslee Conveyor Dishwasher Error Code C3: Pre-Rinse Heating FailureC5Blakeslee Conveyor Dishwasher Error Code C5: Pre-Rinse OvertemperatureC7Blakeslee Conveyor Dishwasher Error Code C7: Pre-Rinse Pump TrippedE1Blakeslee 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
C2Questions about Blakeslee error code C2
Does C2 mean the pre-rinse is cold?

Not necessarily. It means the probe failed, so the temperature cannot be read.

Can I keep running racks?

The manual says to suspend washing.

Has the heater failed?

The alarm names the probe, not the heater.

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