2 Red LED Blinks means there is an RF communication error such as Framing, 
CRC, buffer overflow, etc.
3 Red LED Blinks means that the transmitter fails to communicate with the 
sensor probe
4 Red LED Blinks means the transmitter’s Battery is low.
The highest priority error code is 1 LED blink for No good message from 
the transmitter.  The lowest priority error code is 4 LED blinks to indicate 
transmitter’s low battery. If multiple errors occur at the same time such as bad 
sensor probe and low battery, then the receiver’s red LED will blink 3 times. 
Only when this error clears at the transmitter, the receiver will then blink 4 times 
to indicate the next error, if any.
The red LED error reporting occurs every 10 seconds regardless of the 
transmission time interval.
Any error code except for the low battery means Probe Error for the chart 
recorder.
 Wireless Transmitter Error Codes  Description    
 2 Red LED Blinks          RF Communication Error 
 3 Red LED Blinks           Failed to communicate with sensor 
probe
 4 Red LED Blinks          Low Battery
 Wireless Receiver Error Codes     Description    
 1 Red LED Blink    No Good Message received from 
Transmitter      
 2 Red LED Blinks          RF Communication Error 
 3 Red LED Blinks           Transmitter Failed to communicate  
with Sensor  
 4 Red LED Blinks          Transmitter Low Battery
Wireless Temperature/Humidity Chart Recorder
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