F4 Error On Display, Booklet States Pressure Switch Fault?

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Hotpoint washer F04 filling continuously and draining intermittently

The problem

A Hotpoint washing machine starts normally and fills with water, but once water reaches the door glass it begins to drain while continuing to fill. It never appears to stop taking in water, and even when the timer reaches 0 it continues rotating, filling and pumping out intermittently. The user had already cleaned the sump filter, pressure chamber and rubber tube to the pressure switch, and checked the sink trap and drain pipe for blockages.

Likely cause

The accepted diagnosis is that error code F04 indicates the pressure switch is stuck on empty, or the switched signal is not reaching the control due to a wiring, connection or module fault. A blockage in the pressure chamber or pressure tubing was also identified as a possible cause, although the user reported cleaning these parts.

What fixed it

Recommended action was to check the pressure switch itself, along with its wiring and module connections. If the pressure system has already been cleaned and the fault remains, the pressure switch or its electrical connections are the most strongly supported diagnosis. The exact repair carried out was not confirmed.

Checks to try

• Cleaned sump filter
• Cleaned pressure chamber
• Cleaned rubber pipe leading to the pressure switch
• Checked sink U-bend and drain pipe for blockages
• Check pressure switch
• Check wiring
• Check module connections

Parts or tools mentioned

• Pressure switch