Hydrotek System: Pump Clicking, Cycling, Booster Pump Issues

New homeowner with Hydrotek 2120 timer and 6000 valve (4 zones). Pump clicks, cycles, shuts off after ~1 minute, waits 5 minutes. Priming each zone individually works temporarily. Suspects check valve before booster pump.

Clicking = Thermal Overload

The 5-minute wait is the motor's thermal protector cooling. Causes:

• Motor locked up (corrosion from disuse).
• Low voltage to pump.
• Pump mechanically bound.

Follow-Up: Priming Works Briefly

After priming each zone, system runs. But timer cycle reverts to clicking. Owner found a valve/check valve on supply line before pump (city water boosted).

Diagnosis

• That valve is likely a backflow preventer or check valve failing—restricting flow to booster pump.
• Hydrotek 6000 valve is a complex indexing valve; parts unavailable.

Recommended Path

1. Replace the check valve/backflow before pump (take old one to supply house).
2. Test: run system with pump power OFF (city pressure only). If it works, pump/booster is the issue.
3. Long-term: Replace Hydrotek indexing valve with 4 standard electric valves + modern controller. Hydrotek parts are obsolete.