Diagnostics - Prince Castle EHB34-2 Series Service Manual

For all diagnostic messages on the holding bin, the message will appear on the timer bar located at the pan that is triggering the message.
The message is a two-word message that will cycle through on the timer bar in addition to the product name at that pan location.
1. WARM | UP | XXXX – When turning on holding bin the warm up message will appear until heaters reach within 15°F set point.
a. Cleared when within 15°F of the set point.
2. HTR | OFF | XXXX – Heater off message appears when both the upper and lower heaters are off.
a. Cleared when heater is turned on.
3. HTR | LOW | XXXX – Heater low appears if the temperature falls 15°F below the set point.
a. Cleared when temperature is back in range. If not cleared, would require a service technician to repair.
4. HTR | HIGH | XXXX – Heater high appears if the heater is above 285°F for 20 minutes.
a. Cleared when temperature is back in range. If not cleared, would require a service technician to repair.
5. RLY | SHRT | XXXX – Relay short error occurs when there is a thermocouple or heater problem.
a. Bin requires service to further troubleshoot and repair.
6. RLY | OPEN | XXXX – Relay open error occurs when there is a thermocouple or heater problem.
a. Bin requires service to further troubleshoot and repair.
7. COMM | DOWN | XXXX – Communication down error occurs when the temperature data is not being properly communicated.
a. Check that unit is in bin1/BAR2/BAR3. Otherwise, requires service technician to troubleshoot.
1. First, un-plug any communication cables from the holding bin. These devices will interfere with the timer bar boot loading process.
2. Place the update files on the USB flash drive in the main directory (Do not put them in a folder on the flash drive). There are five* files that
you will need to put on the drive. Two for the controller board, mainbin.hex and DHBFWBIN.TXT. Three for the timer bars, mainbar.hex,
auxbar.hex and DHBFWBAR.TXT.
3. Once all files are on USB drive, turn power off to bin and place the USB drive with the files into USB port on the front of the bin.
4. While holding down crown button on front right side of the bin, above the power switch, turn the power to the bin on.
5. Keeping the crown button pressed, wait for the "BL" (boot load) message to appear on the screen. Release the button approx. 5 seconds
after the "BL" message appears or once the USB stick light begins to flash.
6. Wait for the display to show:
a. (blank while upgrading main bin firmware)
b. BL00 (searching for timer bars to upgrade)
c. BL04 (4 timer bars left to upgrade)
d. BL03 (3 timer bar left to upgrade)
7. You can check the version number on the timer bars by pressing the Prince Castle logo button and the down button on timer bar.
*EHB34-2 requires seven files. The two additional to those listed are mainbar2.hex and auxbar2.hex.
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Diagnostics

DIAGNOSTICS
USB Update Procedure
e. BL02 (2 timer bars left to upgrade)
f. BL01 (1 timer bar left to upgrade)
g. BL00 (0 timer bars left to upgrade)
h. BN04 (4 timer bars detected and done with programming)
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Extend Holding Bin
EHB34-2 Series
Printed in USA 10/19 © 2019