Irritrol RD-600 Summer Overheating in Arizona Sun

12-year-old RD-600 in AZ: works until summer, then overheats (direct afternoon sun). Pull faceplate, cool 1 day, works temporarily. Second summer failing.

Heat Damage Reality

Phoenix-area pros report RD-600s handle heat well. But direct sun + age = possible thermal failure.

Diagnostic Option

Remove faceplate, take to Sprinkler World of Arizona for bench test (diagnose repair vs. replace).

Mitigation

• Relocate controller to shaded area
• Install sun shield/awning
• Replace with modern unit (better thermal design)

Don't assume heat is only cause—test first.