In the first instance you can call our dedicated first-line homeowner helpline on 0330 311 2201, option 1. They can help troubleshoot and diagnose a range of basic issues. If they are unable to help, NIBE have been busy expanding our network of trained approved partners across the country. The cost of this is not included in the payments for FlexiServ, which cover your annual service only, so you would deal directly with the local approved partners.