Chapter 5 Troubleshooting method
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Chapter 5 Troubleshooting method
5.1 error display
The display LED flashes in a 0.5 second bit period, or the external communication
connection device displays an error message.
OPEN indicates that the sensor is disconnected or not connected:
Power off check the sensor connection status. If the sensor is not broken, short the + and
- poles with a wire and select the thermocouple sensor to see if the temperature controller
displays room temperature. If the room temperature is not displayed, the thermostat may
be damaged. Please contact our technical support department.
Make sure the sensor is connected correctly and select the corresponding input type
CM-4TM
LED condition
When disconnecting
sensor input
When the
temperature range is
exceeded
PWR LED
Red light on
CH1 LED
Red light flashes(0.5 second period)
CH2 LED
Red light flashes(0.5 second period)
CH3 LED
Red light flashes(0.5 second period)
CH4 LED
Red light flashes(0.5 second period)
Communication
output (decimal
number)
Communication
output‘31000’
Communication
output'30000'(upper
limit)
Communication
output‘-30000’(lower
limit)
For PC only
display‘OPEN’
display'HHHH (upper
limit)'
display‘LLLL (lower
limit)’
5.2 Communication troubleshooting method
When using this product to connect to a communication external device without response
or abnormal data:
■ Make sure that the communication converter is normal.
■ Do not route the AC power cord with the communication cable.
■ Please supply power separately for the converter and the product.
■ If the product is damaged due to internal circuits or strong interference, please contact
our technical support department. In addition, the external interference of the product
should be shielded as much as possible, and the internal circuit of the product may be