Why a Toro 252 Solenoid Gets Hot

Common Causes of Solenoid Overheating

A solenoid on a Toro 252 valve becomes hot during operation.

Water supply off – no cooling flow through the valve.
Faulty solenoid – but usually the controller would shut down the zone or blow a fuse.
Low voltage from a bad wire or splice – low voltage increases amperage, causing heat.

Measure voltage at the controller terminals (should be 24–28 VAC). If okay, measure at the solenoid. A significant drop indicates a wiring issue.

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