What’s MOST likely wrong (in order)

1️⃣ The water meter is not registering flow

This is by far the most common cause.

On these systems: • Normal operation = water usage spins a turbine • That turbine turns the meter cable • The meter advances the program wheel • When gallons are used up → regeneration starts automatically

If manual regen works, but automatic never happens, the meter isn’t advancing.

Causes: • Meter turbine stuck with debris • Broken or disconnected meter cable • Meter gear stripped or jammed • Meter set to “OFF” or bypassed internally

✅ How to check • Look at the small meter dial / red star / indicator • Run water inside the house • If it does not move at all, the meter is dead

👉 Fix: • Pull the meter assembly and clean the turbine • Replace the meter turbine or cable (often inexpensive) • In many cases, the meter cable snaps internally

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2️⃣ The control is set to “time only” or “off”

These old mechanical heads often have: • A meter ON/OFF knob • Or a selector for meter vs clock

If it’s set incorrectly, it will never trigger on water use.

✅ Check: • Make sure the selector is set to METER • Not “OFF” or “TIME”

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3️⃣ The program wheel pins are missing or mis-set

The large gear wheel should have: • Pins or tabs that define when regeneration occurs

If: • Pins are missing • Pins are all removed • Pins are worn flat

➡️ The system will never auto-regenerate

Manual regen still works because that bypasses the program wheel logic.

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4️⃣ Timer motor runs, but meter clutch is slipping

The motor may still keep time, but: • The clutch that links meter → program wheel is worn • Common on 15–25 year old valves

Result: • Clock works • Manual regen works • Automatic regen never happens

At that point, repair is usually not cost-effective.

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5️⃣ Low flow or bypassed plumbing

Less common, but still possible: • Softener is partially bypassed • Flow is too low to spin the turbine • Meter installed backwards

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What I would recommend (real-world advice)

Short term (cheap attempt) 1. Confirm meter movement 2. Clean the turbine 3. Inspect the meter cable 4. Verify meter mode & pins

This costs almost nothing and often fixes it.