Before diving into troubleshooting, ensure your unit is correctly matched to your load.
Running the GMR32B at its absolute limit (32A) in a high-temperature environment will lead to thermal runaway.
Resistive (heaters) or Inductive (transformers/motors). gmr32b phase controller manual hot
Troubleshooting Your GMR32B Phase Controller: Manual & Overheating Guide
The is a robust controller, but it is not "set and forget." High heat is almost always a symptom of poor thermal dissipation or loose electrical junctions. Ensure your thermal paste is fresh and your cabinet is breathing, and the unit should return to stable operation. Before diving into troubleshooting, ensure your unit is
If your heatsink has an integrated fan, ensure it is spinning freely and not clogged with grime.
Most digital variants of the GMR series feature LED indicators for thermal protection: Most digital variants of the GMR series feature
To prevent "hot" failures and extend the life of your controller, follow this quarterly routine: