Troubleshooting; Wiring Diagram; Corrective Action - Prince Castle DHB-BK Série Mode D'emploi

Problem
Display flashes Op & r L.
Display flashes Hr & r L.
Display flashes Op & r L.
Display shows HHH for an extend-
ed period of time and heater sur-
face temperature is hot.
Display shows HHH for an extend-
ed period of time and heater sur-
face temperature is cool.
DHB-BK1 541-520 Rev. C

Troubleshooting

Possible Cause
Open relay. Circuit inoperable.
Shorted relay. Circuit inoperable.
Open heater.
Unplugged ribbon cable between
power and main circuit boards.
Temperature is below 75°F.
Heater inoperable.
Probe inoperable.
Relay inoperable.
Temperature is above 300°F
(abnormal operation).
Probe is inoperable.

Wiring Diagram

11
Product Holding Bin
DHB-BK Series

Corrective Action

Replace power circuit board.
Replace power circuit board.
Test heater resistance (150.2 Ohms).
Replace heater if necessary.
Verify ribbon cable connection.
Normal display during warmup.
Test heater resistance (150.2 Ohms).
Check for open thermocouple wires from probe.
Replace heater/probe assembly.
Replace power circuit board.
Diagnostic circuit inoperable. Replace power cir-
cuit board.
Check for pinched thermocouple wires from
probe. Replace heater/probe assembly.
Printed in USA 1201 © 2002