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TROUBLESHOOTING
Problem
A. Display flashes
"Opn" & "rEL"
B. Display flashes
"SHr" & "rEL"
C. Display shows "LLL"
D.Display shows "HHH" for
an extended period of time
To reset all times and temperatures to the factory settings, turn unit off, press and
hold the UP and DOWN ARROW BUTTONS at the same time, turn unit back on. A "P"
will appear in the display and all times and temperatures will be reset to the original
factory settings.
WIRING DIAGRAM
528-500revA
Cause
Open relay.
Circuit inoperable
Shorted relay.
Circuit inoperable.
Open heater.
Temperature is below 75° F
Heater inoperable.
Probe inoperable.
Relay Inoperable
Temperature is above300° F
(abnormal operation)
Solution
Replace Power Circuit Board
Replace Power Circuit Board.
Test heater resistance.(150.2 Ohms)
Normal display during warm up.
Test heater resistance.(150.2 Ohms)
Check for open thermocouple wires from
probe. Replace heater/probe assembly.
Diagnostic circuit inoperable. Replace
Power Circuit Board.See B above.
assembly.
5
Printed in USA 1/06 © 2006
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