Repair manual

TROUBLESHOOTING
5 --- 2
COMPUTER CONTROL SYSTEM
POSSIBLE CAUSE(S) SUGGESTED REMEDY
Symptom #1 --- Computer controller displays: PROBE - OPEN - PROBE - SHORT and
alarm buzzer sounds
D Internal problem with computer controller.
D Loose connections at computer controller.
D Shorted or open RTD probe.
D Verify display integ. in the 2nd level program-
ming. If t he controller has been programmed the
computer may need to be replaced.
D Tighten connections.
D Use the chart in the Technical Appendix (page
NO TAG) to determine if probe is bad. Replace if
necessary.
Symptom #2 --- Computer controller displays: ERROR - HIGH - TEMP - LIMIT
D Actual temperature exceeds programmed limit
value. Default 605_F (319_C).
D Internal problem with computer controller.
D Faulty burner valve relay. Replace relay.
D Faulty computer cables
D Verify display integ. in the 2nd level program-
ming. If t he controller has been programmed the
computer may need to be replaced.
Symptom #3 --- Computer controller displays: MTR-SPD
D Motor speed does not match set point.
D Motor indicated that the computer is not receiv-
ing a signal from the pickup.
D Recalibrate the motor speed. See Calibration
and Adjustment (page 3---8).
D Fuses on the control board may have blown.
Check and replace if needed.
D Wires from the pickup are not connected or bro-
ken. Connect or replace.