UK Appliance Repair Questions? Ask a Technician for Answers ASAP
First thing to do is get a kettle of boiling water, remove the filters and pour the boiling water into the sump that was directly below the filters, leave for about 5 minutes and then pump it out.
OK error 1 & 3 indicate that there is a problem with the pump out - that is either it is taking too long to pump out, a pipe is blocked or the pressure sensor pipe is blocked. I want you initially to keep trying to get it to pump out by using boiling water, the fact that you have dirty water confirms that drain water is coming back into the machine. how have you got the drain hose connected?
Do you require further assistance?