Printed in USA 10/10 © 2010
12
541-531revD-EN
Product Holding Bin
DHB-BK41/43
PROBLEM
PROBABLE CAUSE
SOLUTION
Display flashes
Opn
and
rEL
.
Open relay. Circuit inoperable.
Replace power circuit board.
Display flashes
SHr
and
rEL
.
Shorted relay. Circuit inoperable.
Open heater.
Unplugged ribbon cable between power and
main circuit boards.
Replace power circuit board.
Test heater resistance (150.2 Ohms).
Replace heater if necessary.
Verify ribbon cable connection.
Display flashes
Opn
and
rEL
.
Temperature is below 75°F.
Heater inoperable.
Probe inoperable.
Relay inoperable.
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.
Display shows
HHH
for an extended period of
time and heater surface temperature is hot.
Temperature is above 300°F (abnormal
operation).
Diagnostic circuit inoperable. Replace
power circuit board.
Display shows
HHH
for an extended period of
time and heater surface temperature is cool.
Probe is inoperable.
Check for pinched thermocouple wires from
probe. Replace heater/probe assembly.
Troubleshooting
