UK Appliance Repair Questions? Ask a Technician for Answers ASAP
Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! I suspect the issue lies with the heater circuit in the machine. If you open the door mid cycle during any cycle, is the water hot and steamy?
The P4 cycle is a short cycle (low heat). The relay may be weak and failing under heavier loads. I suspect the main electronic control module will need to be replaced.
It does sound like the module (PCB) has issues with the intermittent operation.