Blakeslee Conveyor Dishwasher Error Code B3: Boiler 1 Heating Failure
B3 BOILER 1 HEATING FAILURE means boiler 1 is not heating. The manual says to turn the appliance off with the ON/OFF button and on again after a few seconds. If the alarm persists, call a service technician.
High: boiler 1 cannot heat, so the rinse cannot meet its temperature.
- Code
- B3
- Maker
- Blakeslee
- Equipment
- Conveyor dish machines
- Applies to
- RC-series rack conveyor with scrolling-text display and LED bar
What does Blakeslee error code B3 mean?
The rinse boiler is heated electrically and the control checks that its temperature rises after the heater is switched on. If boiler 1 does not warm as expected, the control raises B3 BOILER 1 HEATING FAILURE. The manual's meaning is that boiler 1 is not heating. It gives one operator step: use the ON/OFF button to turn the machine off, wait a few seconds and turn it on again. A short reset like that can clear a one-off alarm caused by a power dip. If the alarm persists, the manual says to contact Technical Service, because the cause is then a heating element, a relay, a safety device or the supply, none of which an operator can safely test. B3 is about heat that never arrives; B5 is heat that goes too high.
Affected models and control systems
Blakeslee RC-series rack conveyor dishwasher. The PDF is Blakeslee's RC44 User Manual and prints no model name; the same alarm list appears in the RC62 manual.
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
- B3 BOILER 1 HEATING FAILURE on the display
- Final rinse is cold
- Rinse never reaches rated temperature
- Alarm returns after the ON/OFF reset
Possible causes
Likely causes — what usually sits behind error code B3 on this control. A technician confirms which one it is before any part is replaced.
- Boiler 1 heating element burned out
- Heater contactor not closing
- Boiler safety thermostat open
- Missing phase at the machine supply
Safe checks before calling for service
- Press ON/OFF to turn the machine off, wait a few seconds, then press it again, as the manual instructs.
- Check that the machine's breaker and wall disconnect are on.
- If B3 comes back, stop washing.
- Do not open panels or touch the boiler.
- Write down how many times you reset it and when the alarm returned.
How a technician diagnoses error code B3
- Read the alarm history and note whether B2 preceded B3.
- Measure supply voltage on all phases while the boiler heater is called.
- Check the element for continuity and for leakage to ground with power locked out.
- Test the heater contactor and the boiler safety thermostat.
- Confirm the probe reads correctly, then replace the failed part.
- Boiler heaters draw high current at 208 to 240 volts or more.
- Testing the contactor and element means working inside live panels.
- The boiler stays scalding hot after use.
How error code B3 differs from similar codes
B3 is boiler 1 not heating. E3 is the matching alarm for wash tank 1.
Technical reference
- Maker documentation
- Blakeslee owner support
- Edition
- COD. 4950E_U_USA, Ed. 00 - 09/2016
- Models / control
- RC-series rack conveyor with scrolling-text display and LED bar
- 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.
Related Blakeslee conveyor dish machine error codes
Will turning it off and on fix B3?
Sometimes, if the alarm came from a brief supply dip. If it returns, the heating circuit needs a technician.
How long should I wait before turning it back on?
The manual says a few seconds.
Is it safe to wash without the rinse boiler?
Not for a proper rinse. Hold off until service.
Need help with Blakeslee error code B3?
A technician confirms the cause on site and gives you the price in writing before any work starts.