Given that I don’t have access to a real GMR32B manual, I can instead write a covering the likely issues, troubleshooting, and safety for a phase controller running hot — structured like a manual excerpt.

If the GMR32B unit or the connected phase controller is physically hot to the touch or has triggered a thermal alarm:

: Typically 300V to 400V (50/60Hz), though some variants support a wide input of 24–240V AC/DC. Protection Functions :

GMR-32B. Jiefeng Code : JDQ-GMR-32B. Color : Black. Lead Time : 3 Days. Add to basket Stock: 1000.

: Ensure the control cabinet has adequate airflow if the ambient temperature is near 55°C.

In dusty environments like engine rooms, debris can interfere with relay contacts. Ensure the unit is clean and the IP20 protection is not compromised.

: The GMR-32B is rated for ambient temperatures between -10°C and +55°C (some models up to +60°C). Exceeding this range in a cramped control box can cause overheating.