Ch. 19. Air Temperature Controller Sec. 19.9. Error messages
This error is the result of the ATC overheating internally which has caused one of the two thermal
switches to trip. A high pitched audible alarm will also sound. The possible reasons for this error to
happen can be:
• The Heater power is set too high for too long in the manual mode. This will cause the heater case
to overheat and trip its safety switch. To avoid this, do not drive the heater power at max power
for more than a minute or keep the heater case temperature below 50C
• The exit air is too hot causing the thermal switch in the exit air to trip. It is possible to run the
heater at max power with the fan set to 100% for a longer period of time. This will keep the heater
case cool but will generate too much hot air and will over heat the heater hose. The exit air switch
trips at about 70C.
• The door on the enclosure is not latched completely. If the door is left ajar, it may be closed
enough to keep the door detection switch closed. This essentially allows the air to escape and
forces the ATC to ramp up the heat to try to compensate for the heat loss.
• The ATC air hose has fallen off or is disconnected. Same situation as above. The interior of the
Cypher enclosure is cooling down while the ATC continues to heat up trying to compensate.
19.9.3. Noncritical Error messages
Noncritical error messages indicate a problem with the setup and can be cleared after the fault is cor-
rected. After the error is cleared, the message box will turn green and full function of the ATC is
restored.
19.9.3.1. Error: Head Temperature Not Updating
BETA
Page 223
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