Problem with Fisher Paykel washing machine?

Hi,I have a F+P GW708U 7.5kg top loader machine..it started stopping and beeping while filling the other day and did that everytime it had to be filled on a cold wash...I rang F+P who said they could send a service person out or buy a new machine as its almost 15yrs old..today I did a cold wash and it stopped shortly after filling and started flashing hot/cold..so put hot tap on and did a wash on cold/warm and its working fine.seems to b struggling to fill with just cold water..any ideas what the problem mite be? thankyou!