| Observed Symptom | Possible Cause | Solution | | :--- | :--- | :--- | | | Normal operation within temperature limits. No immediate action required. | Ensure ventilation slots are not blocked. | | Very hot but load is OFF | Internal power supply short circuit / Failed component. | Replace the GMR32B immediately. | | Very hot + Load constantly switching ON/OFF | Overload on the internal relay contacts (motor contactor coil drawing excessive VA). | Check the contactor coil power rating (Must be ≤ the GMR32B contact rating of 250VAC 6A). Install an external intermediate relay if necessary. | | Hot + Voltage Unbalance indicator ON | Severe voltage imbalance causing excessive internal current draw due to harmonics. | Check mains power supply lines. Consult a power quality specialist. | | Hot in high ambient temperature | Ambient temperature > +55°C exceeds device specifications. | Relocate the control panel to a cooler area or install a cabinet cooling fan. | | Hot + Missing N-phase (for Smart variants) | Loss of neutral causing voltage spikes across the internal power supply. | Identify and restore the N-phase connection in the power system. |
The following technical specifications are essential to understand the GMR32B phase controller's capabilities: gmr32b phase controller manual hot