Wireless printing problem Canon MP495

I have just changed to a new wifi account but now I cannot print from my Canon MP495 printer wirelessly. 'Communication error has occurred'. Tried to search in the Airport utility but no luck. Deleted my printer queue thinking I would just reinstall it but Airport does not see the printer wirelessly. I am running Mac OSX 10.6.8 on an iMac. Airport utility 5.6.1. Help please!