Hardie 16-Zone Controller Failing: Transformer Overheating, Replacement Options

14-zone system, 12-year-old Hardie controller. Screen blanks after 5 min unless dial turned. Sprinklers never run. User has 16 zones, 18-zone controller. Transformer model 57LEIB24167 found very hot after unplugging.

Diagnosis

Matt: "It sounds as if your transformer may be bad. The battery only operates the display for a few minutes then blank out... The battery will not operate the sprinklers."

Transformer Test

1. Voltmeter: terminals should read 23-27 VAC.
2. No meter? Jump one transformer wire to COM, touch other to a zone terminal → tiny spark + sprinklers on = transformer good. Nothing = transformer bad.

Replacement Controllers for 16 Zones

• Hunter ICC with 8-zone module (base is 4-zone, need expansion).
• Rain Bird ESP-LX series with expansion module.
• Toro Total Control System (now owns Hardie line).
• Exact Hardie replacement if available.

Hunter PRO-C maxes at 15 zones (base 3 + 3 + 9), so insufficient for 16 zones.