Munters T2 SNS ERR Error Code
Error in temperature sensor 2
Source: hvac/munters/0d9d3440__smart-c__mntr-smart-c-d-iom.pdf
What does Munters T2 SNS ERR mean?
On a Munters Smart C/D climate controller, T2 SNS ERR indicates a fault in temperature sensor 2. According to the manual, this sensor is either out of order, disconnected, or shorted, leaving the controller without a valid reading from that input. The alarm appears on the main screen, shown alternately with the standard display.
Symptoms
- T2 SNS ERR alarm displayed on the main screen
- Temperature reading from sensor 2 is invalid or absent
- Alarm relay triggers and the message repeats until resolved
- Ventilation or heating tied to sensor 2 responds abnormally
Common causes
- Temperature sensor 2 is out of order
- Temperature sensor 2 is disconnected
- Temperature sensor 2 wiring is shorted
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Diagnostic steps
Acknowledge the alarm
Press OK on the main menu to reset the alarm relay; the manual notes the message continues until the problem is fixed.
Check the sensor 2 connection
Inspect temperature sensor 2 wiring for a disconnected lead, a cause listed in the manual.
Inspect the wiring for a short
Check the sensor 2 cable for a short circuit, which the manual gives as a possible reason.
Replace a failed sensor
If sensor 2 is out of order, install a working temperature sensor on that input.
Disable the alarm only if the sensor is removed deliberately
The manual states a deliberately removed sensor's error alarm can be disabled via the Calibration menu.
When to call a professional
The Smart C/D manual cautions not to open the controller box if a hardware problem arises, and to contact an authorized electrician. Call a qualified technician if the alarm persists after checking the sensor connection, if you cannot safely work inside a mains-powered enclosure, or if replacing and recalibrating the sensor is beyond your experience.
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