Irritrol RD600 9V Battery Draining Weekly—Controller Failure

An Irritrol RD600's 9V battery dies weekly (increasing frequency). Display blinks, system non-functional until battery replacement. Incoming 24VAC power confirmed good.

Root Cause

Battery should only drain during power outages. Frequent drainage with stable power indicates controller circuit board failure—likely a leakage current path draining the battery.

Verification

• Confirm no extended power outages (check clocks, neighbors)
• Verify 24VAC present at controller continuously
• If power stable and battery still drains → controller defective

Resolution

This is a known failure mode on Rain Dial controllers. Replace with new Irritrol Rain Dial RD-600-INT (~$210). Before purchasing, try reseating the ribbon cable between faceplate and base—occasionary fixes intermittent contact issues.