Munters T1 SNS ERR

What does Munters T1 SNS ERR mean?

On a Munters Smart C/D climate controller, T1 SNS ERR means the controller has detected a fault in temperature sensor 1. The manual states this sensor is either out of order, disconnected, or shorted, so the controller can no longer read a valid temperature from that input. The alarm is shown on the main screen, alternating with the normal display.

Symptoms

• T1 SNS ERR alarm shown on the main screen, alternating with the normal display
• Temperature for sensor 1 reads as invalid or missing
• Alarm relay activates and the alarm repeats until the fault is cleared
• Climate control that depends on sensor 1 behaves abnormally

Common causes

• Temperature sensor 1 is out of order
• Temperature sensor 1 is disconnected
• Temperature sensor 1 wiring is shorted

Diagnostic steps

1. 01

   Acknowledge the alarm

   Press OK on the main menu to reset the alarm relay. The manual notes the alarm message keeps displaying until the underlying problem is resolved.

2. 02

   Check the sensor 1 connection

   Inspect the wiring for temperature sensor 1 for a disconnected lead, since the manual lists a disconnected sensor as a cause.

3. 03

   Inspect the wiring for a short

   Examine the sensor 1 cable for a short circuit, which the manual lists as a possible reason for the alarm.

4. 04

   Replace a failed sensor

   If the sensor is out of order, fit a working temperature sensor on input 1.

5. 05

   Disable the alarm only if the sensor is removed deliberately

   The manual states that if a sensor was deliberately removed, the sensor error alarm can be disabled via the Calibration menu.

When to call a professional

The Smart C/D manual cautions that if any problem arises with the hardware you should not open the box and should contact an authorized electrician. Call a qualified technician if checking the sensor connection does not clear the alarm, if you are unsure how to work safely inside a mains-powered controller enclosure, or if sensor replacement and recalibration are needed beyond your experience.