Blakeslee Commercial Dishwasher Error Code B2: Boiler Probe Fail
B2 BOILER PROBE FAIL means the temperature probe of the rinse boiler has failed. The manual's only instruction is to contact Technical Service. Stop using the machine and have a service technician test the probe.
High: the control cannot regulate the rinse boiler, so the machine should not run until the probe is fixed.
- Code
- B2
- Maker
- Blakeslee
- Equipment
- Dish machines
- Applies to
- D-18D / D-18V digital-control door-type
What does Blakeslee error code B2 mean?
The rinse boiler needs an accurate temperature reading, because the control heats the boiler until the probe says the rinse water is hot enough and then holds it there. If the probe reads open, shorted or outside any believable range, the control has no safe way to regulate the heater. It therefore stops relying on the boiler and shows B2 BOILER PROBE FAIL. The manual describes the entry as a rinse boiler temperature probe failure, and the instruction given is to contact Technical Service rather than any operator step. A failed probe is a cheap part, but the alarm is serious in operation: without a trusted rinse temperature the machine cannot prove that the final rinse is hot enough. The display shows B2 followed by the words BOILER PROBE FAIL. A separate alarm, B3, covers a boiler that does not heat, so the two should not be confused.
Affected models and control systems
Blakeslee D-18D / D-18V digital-control hood-type dishwasher. The manual's cover prints D-19 L and D-19 LRS and names no D-18 model, so the alarm list is read as covering this hood-type family.
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
- B2 BOILER PROBE FAIL on the display
- Rinse water is cold or inconsistent
- The machine blocks cycles that need a rinse
- Boiler alarm repeats after each restart
Possible causes
Likely causes — what usually sits behind error code B2 on this control. A technician confirms which one it is before any part is replaced.
- Boiler temperature probe open or shorted
- Probe lead damaged near the hot boiler
- Probe connector corroded by steam and detergent vapor
- Probe input on the control board no longer reading the sensor
Safe checks before calling for service
- Switch the machine off and on once to confirm the alarm is still present.
- Do not repeat cycles if B2 returns; the rinse temperature cannot be trusted.
- Leave the machine off and keep the area around it dry.
- Do not touch the boiler, which stays hot after use.
- Write down the display text and whether other alarms appeared with it, and give both to the technician.
How a technician diagnoses error code B2
- Read the alarm record and confirm B2 is the active entry.
- Measure the boiler probe resistance at the connector with power off and compare it with the value for the boiler's temperature.
- Inspect the probe lead and connector for heat damage, moisture or corrosion.
- Check the probe input on the control board with a known resistance substituted for the probe.
- Replace the probe, lead or board according to which one fails, then verify the rinse reaches temperature.
- The probe sits in a hot, wet boiler that stays dangerous after the machine is switched off.
- Reaching the connector and control means opening panels near live line-voltage wiring.
- The control board input can only be proven good or bad with a meter and a reference resistance.
How error code B2 differs from similar codes
B2 reports a sensor failure; B3 reports the boiler failing to heat, and B5 reports overheating. They point to different parts of the same rinse boiler circuit.
Technical reference
- Maker documentation
- Blakeslee owner support
- Edition
- COD. 3100ET_U, Ed. 06 - 09/2018
- Models / control
- D-18D / D-18V digital-control door-type
- Section
- Chapter 8.2 Alarms, table 3 (p. 39)
- 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.
Related Blakeslee dish machine error codes
Can the machine run with B2 showing?
It should not. The rinse temperature cannot be confirmed, and the dishes may not be rinsed hot enough.
Is the boiler broken if I see B2?
Not necessarily. The alarm names the probe, and the boiler itself may be fine.
Will B2 clear on its own?
A restart may clear the display, but a probe that has failed once usually fails again, so book a visit.
Need help with Blakeslee error code B2?
A technician confirms the cause on site and gives you the price in writing before any work starts.