My mat is not heating evenly. It is plugged in accurately. What is wrong?

The most common cause of controller issues is a poor connection between the mat connector and the controller plug. The plug must be inserted fully and very tightly. A loose connection can cause signal loss or accumulated errors.

Step 1: Reset and reconnect the controller

Often, the issue can be resolved with a simple reset:

1. First, unplug the controller from the wall outlet.

2. Then disconnect the controller plug from the mat connection terminal.

   When disconnecting, always use two hands:

   • Hold the mat connector firmly with one hand
   • Gently pull the controller plug straight out with the other hand
   • Do not pull on the wires, as this can loosen internal connections
3. Reconnect the controller plug tightly to the mat.
4. Plug the controller back into the wall outlet.

Reconnection and reset are the most common ways to clear errors and reload the controller.

Step 2: Check heating performance

There is an article explaining how to check whether the mat is heating properly. It focuses on low-heating issues but is also useful for understanding how the system works.

In short:

• If part of the mat has something on top of it (blanket, pillow, body, etc.), heat will be partially blocked, and those areas may feel warmer to the touch.
• The mat must be fully covered while preheating.

If the mat is only partially covered, temperature sensors located in different layers may report uneven or conflicting readings to the controller. Over time, this can cause calibration issues or improper operation.

Always cover the mat completely while it is preheating to the set level.

Low Heating FIR Mat Temperature Testing

Step 3: Temperature consistency test

1. Set the mat to Level 7.

2. Cover it fully with a thick blanket.

   After 30 minutes, 1 hour, and 2 hours:

   • Remove the blanket briefly
   • Immediately measure the temperature in several different areas

Because the mats are handmade, small variations are normal. However, after about 2 hours of preheating, the temperature difference between heated areas should generally not exceed 15–20°F.

If there is a much larger temperature difference across the mat surface, this may indicate a controller issue or sensor calibration problem.

Additional precautions

• Controllers are heavy-duty and ventilated, but they should not be placed on the hot mat, as overheating can damage them.

  Power spikes (for example, during storms, blackouts, or grid fluctuations) can damage electronics.

  • Unplug the mat when not in use
  • Use a plug-in surge protector when operating the mat

Persistent issues may also result from:

• frequent partial use (only sitting or lying on one section of the mat)
• internal heating elements shifting
• sensor malfunction due to pressure or improper handling

To prevent damage:

• Do not store the mat vertically against a wall
• Do not walk on the mat
• Do not bend or fold the mat while it is hot

If the problem continues and appears to be related to a factory defect, we will arrange a replacement of the controller or, if necessary, the mat itself.