What should you do as a plumber if you cannot install a customers central heating system?

If you cannot install a customer's central heating system, communicate clearly with the customer about the reasons for the inability to proceed, whether due to technical limitations, safety concerns, or regulatory issues. Offer to recommend alternative solutions or qualified professionals who can handle the installation. Ensure to document the situation and follow up with the customer to maintain good communication and customer service. Lastly, consider exploring any additional training or resources to expand your capabilities for future similar requests.