Short answer: V3818TC is a real Clack part number, the circuit board for the WS1TC and WS1.25TC control valves (the three-button, time-clock version of the WS1). On it, E1 is the same error Clack lists for every WS1 as "E1, Err-1001, Err-101: control unable to sense motor movement." Check that the motor is fully engaged and plugged in, that the board is snapped into the drive bracket, and that the reduction gears are all there. Then reset with SET and ▼.
The board gets blamed for this one more than any other part, and it's almost never the board.
Confirming the part
- The WS1TC and WS1.25TC manual lists V3818TC-03BOARD, "WS1/125TC 4DIGIT TMD PCB," in its front cover and drive assembly table.
- Clack's current service parts list shows the same board, marked Softener Default (P1), alongside its sibling V3818TB-03BOARD, marked Filter Default (P8). If you're ordering, that letter matters: TC ships programmed as a softener, TB as a filter.
What E1 means on this board
The TC manual itself only says that if E1, E2, E3 or E4 appears, contact the OEM, and points you to the WS1 and WS1.25 service manual for everything common to the 1" and 1.25" valves. That service manual's troubleshooting table covers TC valves (it notes that TC controls don't have meters) and defines E1 as the control being unable to sense motor movement.
Here's the part worth understanding. A WS1 has no limit switches. An optical sensor reads a reflective coating on one of the reduction gears and the board counts pulses. E1 means the board asked the motor to move and never saw a pulse. That can be a motor that didn't turn, or a motor that turned without the sensor seeing it. Clack's three causes cover both.
Three causes
Clack's three causes for E1, and the fix for each
Work left to right. Disconnect power before you touch the motor or the board.
- 1
Clack's cause
Motor not inserted fully to engage the pinion, or motor wires broken or disconnected.
- 2
Clack's fix
Disconnect power. Make sure the motor is fully engaged, check for broken wires, and make sure the two-pin connector on the motor is plugged into the two-pin connection on the PC board labeled MOTOR.
- 3
What I look for
A motor that's backed out a few millimetres from the casing. It looks seated. It isn't. Push it home without forcing it.
Where it lands
Most E1 calls end here. If the motor was loose or unplugged, reset and watch a manual regeneration before you leave.
- 1
Clack's cause
PC board not properly snapped into the drive bracket.
- 2
Clack's fix
Properly snap the PC board into the drive bracket.
- 3
What I look for
A board sitting on the bracket rather than in it, usually after someone replaced a battery or a motor and didn't press it back until it clicked. The optical sensor on the board has to sit at the right distance from the coated gear or it reads nothing.
Where it lands
If the board wasn't snapped in, the sensor was out of position. Seat it, reset, and E1 should not return.
- 1
Clack's cause
Missing reduction gears.
- 2
Clack's fix
Replace the missing gears.
- 3
What I look for
Three identical reduction gears should be in the drive assembly. One of them carries the reflective coating the sensor reads. A gear that's cracked, lost teeth, or has an oily or dirty coating gives the same E1 as a missing one. Never lubricate them.
Where it lands
Replace damaged gears as a set if you're unsure which one carries the coating. Then reset.
Then reset
The TC manual's reset: press SET and ▼ together, or unplug the 4-pin power plug on the circuit board, wait 3 seconds, and plug it back in. The cover button might be labeled SET HOUR, CLOCK or SET CLOCK; the board itself says SET. For every other control's sequence and for what a reset does and doesn't clear, see the reset page. For E1 across all WS1 controls, the E1 / Error 101 page goes deeper.
Questions I get on this one
What is a Clack V3818TC board? Clack's replacement circuit board for the WS1TC and WS1.25TC control valves, listed as V3818TC-03BOARD, "WS1/125TC 4DIGIT TMD PCB," and marked Softener Default (P1) in the parts list.
What does E1 mean on a Clack TC softener? The control can't sense motor movement. Clack's causes: the motor not fully engaged or its wires broken or disconnected, the board not snapped into the drive bracket, and missing reduction gears.
How do I reset a Clack TC control? Press SET and ▼ together, or unplug the 4-pin power plug on the board, wait 3 seconds, and plug it back in.
Does E1 mean I need a new V3818TC board? Clack's list of causes for E1 doesn't include a defective board. It's the motor, the board seating, or the gears. Check those first; in my experience you'll rarely get past them.
If you're the one who gets these calls
Aquonyx builds city-water treatment systems and sells them only through dealers. The installer keeps the customer and the service call. If that's how you'd rather work, become an Aquonyx dealer.