Clack WS1 Flow Meter Reads No Count - Fault Tree

Why this matters

A Clack WS1 set for metered (demand) regeneration that shows no flow count will never trigger a regeneration on volume, so the softener runs the resin to exhaustion and the customer gets hard water - or, if a day-override fires, it regenerates on time and wastes salt while masking the real fault. The WS1 meter is a paddlewheel turbine reading a magnet through a Hall sensor into the controller. "No count" has a short, ordered fault path: the meter dome, the wiring/plug, the controller meter setting, or the controller board. This tree isolates it without guesswork.

Symptom presentation

The treated-water volume on the display does not change while water flows. On a WS1 you confirm this by entering the diagnostic that shows current flow rate (gpm) and total volume - both stay at zero while a fixture is wide open. Metered regen never initiates; the unit only regenerates if a day override is programmed. The customer reports hard water returning, or a regen schedule that ignores actual usage.

Quick checks

Open a downstream fixture to create real flow, then read the WS1 flow-rate diagnostic on the display. With water moving:

• Flow rate reads a real number (e.g., 3.0 gpm) and total volume increments: the meter IS counting. The "no regen" complaint is a programming issue (meter type, capacity, reserve, regen mode), not a dead meter. Re-check the metered-regen settings.
• Flow rate stays 0.0 with water clearly flowing: the meter is not sending pulses. Continue the fault tree.

Confirm the controller is actually set to a metered mode and not Timeclock - a unit programmed for timeclock-only regen ignores the meter by design and will show no metered behavior even with a healthy meter. Also check whether a recent service or a controller battery/power loss reset the program to defaults; a WS1 that lost its settings can silently revert to a timeclock or wrong-meter configuration and then appear to "not count" when the meter is in fact healthy.

Isolation tree

Branch A - Meter type / programming. The WS1 must be told which meter is installed and what regen mode to use. Verify the meter setting matches the installed turbine and the regen mode is metered (immediate or delayed/scheduled), with a sane capacity and reserve. A unit reading flow but not regenerating belongs here. A unit reading zero flow with correct meter selection moves on. Re-enter the meter and capacity settings and re-test.

Branch B - Meter cable and plug. The meter connects to the WS1 board through a keyed plug. Confirm the meter cable is fully seated in its port on the controller (the meter plug, not the drive or other accessory ports) and the connector is not corroded or backed out. A loose or wrong-port plug is the single most common no-count cause after a service. Reseat firmly, inspect pins for green corrosion, and re-test flow rate.

Branch C - Turbine/paddlewheel fouled or stuck. The meter dome houses a small turbine that spins in the flow. Iron, scale, sand, or debris can jam it. Bypass the unit, relieve pressure, pull the meter dome, and check that the turbine spins freely. A turbine that is seized, fouled, or has a broken paddle sends no pulses. Clean or replace the turbine/dome assembly. Also confirm the dome is installed in the correct orientation and direction of flow.

Branch D - Hall sensor / meter electronics. The turbine magnet is read by a Hall-effect sensor in the meter cap. A failed sensor reads zero even with a spinning turbine. With the dome out and a known-good cable, spin the turbine by hand or with low flow while watching the flow-rate diagnostic. If a freely spinning, properly plugged turbine still reads zero, the meter cap/sensor is dead - replace the meter assembly.

Branch E - Controller board / meter port. If a known-good meter assembly on a known-good cable still reads zero in the correct port with metered mode selected, the WS1 board's meter input has failed. Confirm by swapping in a known-good meter or testing the same meter on a known-good controller. Replace the WS1 controller board (or the full controller) and reprogram. This is the last branch because it is the least common and the most expensive - rule out plug, turbine, and sensor first.

Confirming diagnosis

The deciding observation is the WS1 flow-rate diagnostic with a fixture wide open. Zero gpm with real flow proves the meter chain is broken; the branch is then found by reseating the plug (Branch B), spinning a cleaned turbine (Branch C), and finally substituting a known-good meter (Branch D/E). A non-zero gpm that increments total volume proves the meter is healthy and redirects the entire diagnosis to programming (Branch A). Never replace a WS1 board for "no count" before confirming the turbine spins and the plug is seated in the correct port.

Remediation

Set the correct meter type, capacity, reserve, and a metered regen mode. Reseat or replace a loose/corroded meter cable in the proper controller port. Clean or replace a fouled or seized turbine/dome and confirm correct flow orientation. Replace a dead Hall-sensor meter cap. Replace the WS1 controller only when a known-good meter still reads zero. After any fix, run a measured volume through and confirm the total increments and metered regen will initiate at the programmed capacity. If iron or sediment fouled the turbine, add upstream sediment/iron pretreatment so it does not recur.

References

• Clack Corporation WS1 Service Manual and WS1 controller programming/diagnostics (meter setup, flow-rate diagnostic, meter port wiring).
• Clack WS1 installation and operation instructions (turbine meter assembly, metered vs timeclock regen modes).
• Water Quality Association (WQA), demand-initiated regeneration softener references.
• NSF/ANSI 44: Residential Cation Exchange Water Softeners (metered/demand regeneration performance context).