Ballast Overheat Protection Triggering Frequently & Remedial Measures

Clean dust, lint and scale from air inlet, outlet and heat sink, ensure unobstructed airflow

Check cooling fan: no stall, abnormal noise or low speed; replace damaged fan blade/fan

Check fan wiring and terminals for loose connection or oxidation

Do not seal the ballast enclosure, keep ventilation gap; avoid mounting next to hot pipes or equipment

If ambient temperature >40℃: add exhaust fan / cooling unit or relocate ballast

Keep spacing between multiple ballasts, avoid tight stacking

Verify ballast rated power/current matches UV lamp (LPHO / MP), overload is forbidden

Aged lamp with rising lamp voltage will draw extra power and heat up ballast; test with new good lamp

Check lamp socket and output cable for insulation damage and leakage

High or fluctuating mains voltage increases power loss; install voltage stabilizer if needed

Check input terminals for loose wiring

Degraded / bulging electrolytic capacitors or aged power semiconductor devices cause high loss

Temperature sensor drift leads to false overheat alarm; test by replacing sensor

Dried thermal grease between chip and heat sink; reapply thermal grease (professional service only)

Replace with original matched ballast if internal components are aged

Select ballast with separate air channel and high ambient temperature rating; active cooling fan recommended for MP UV

Reduce frequent on-off cycles, repeated start will accumulate heat