The washer needs to meet its model’s pressure and flow limits while water is entering. A faucet that has pressure at rest can deliver insufficient flow when opened.
Three quantities worth separating
- Static pressure: the supply condition when no water is flowing for that demand.
- Operating pressure: the pressure available while the equipment and other uses are drawing water.
- Flow rate: the amount that can be delivered per unit of time.
An elevated tank provides a condition that depends on the height difference and the losses along the route. Knowing only the tank capacity is not enough. A pump is evaluated at its operating point, not just by rated power.
What data to gather
Find the appliance limits and describe the water source, outage times, simultaneous uses, and changes in flow rate. If measurement or installation changes are needed, a professional should use the proper measuring point and method, without improvising tests near electrical connections.
Also check hoses and fittings and the quality of the source. Dirt or a deformed pipe can restrict flow, but an insufficient new installation needs a supply solution, not disabling the fill detection.
Automatic and manual filling
A semi-automatic may allow manual filling if it is designed that way. Adding water manually to an automatic machine that was not designed for it does not replace meeting its requirements.
Water hammer when opening or closing the water should be treated as a plumbing problem; it should not be confused with drum banging. If the supply used to work and the filling has changed, continue with the inlet diagnosis.
Request a supply check using the exact limits in the manual; there is no tank height or pump power that works for every machine.