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HEATED LANDING ZONE
CHAPTER 6: OPERATOR TROUBLESHOOTING
8
Symptom Possible Cause
No computer display; no flow from
air tower
• No power
• Circuit breaker out
• Low voltage
• Bad fuse
• Bad transformer
• Hi-limit out
No flow from air tower
• Bad latching relay
After 20 minutes of operation
computer display shows PROB
• RTD probe has failed. Isolate failed component
by checking temperature of air and heater plate
with the temperature display keys on the
computer. The plate temperature should be
within ± 15°F of setpoint. The air heat should be
within ± 25°F of setpoint. If both temperatures are
good, the computer is likely bad.
After 20 minutes of operation
computer display shows HI
• Plate heater, plate heater relay or RTD are faulty.
After 20 minutes of operation
computer display shows LO
• Air heater, air heater relay or RTD are faulty