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Error Code Descriptions
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Herpstat Error Code Descriptions (Before serial number 50101800)
0=Sensor not present
1=Sensor is shorted
2-6=Invalid Sensor reading


Herpstat Error Code Descriptions (After serial number 50101800)
1=Sensor not present
2=Sensor is shorted
3=Invalid Sensor reading


Herpstat II Error Code Descriptions
1=Sensor not present
2=Sensor is shorted
3=Invalid Sensor reading
4=High Temp Alarm breached
5=Low Temp Alarm breached


Radio Frequency Interface (RFI) causing occasional or unexplained probe errors.

Herpstats Manufactured Before October 1, 2006
The sensor in Herpstat temperature probes is a digital sensor and sends a data signal back to the Herpstat. In certain situations mounting the probe wire tied close to the AC lines causes a corruption of the temperature data being sent back to the Herpstat. The Herpstats recognize this as bad data and flag it as a probe error turning off the heat source. Should a Herpstat exhibit occasional or unexplained probe errors the solution is to move the probe away from any 120VAC wires with a minimum distance of six inches.

Herpstats Manufactured after October 1, 2006
All Herpstats manufactured in or after October 2006 have a new feature built in that will combat RFI by sampling the probe additional cycles if an error is detected. If the error remains the Herpstat will shut down the output. RFI errors typically only cause a single read error and therefore are weeded out.

How to tell if you have the update.
Simply unplug the sensor from the Herpstat. If it immediately errors then the device was manufactured pre-October. If it takes 4-5 seconds to error then it was manufactured after October 1, 2006 and has the RFI filter.