Arrived onsite for no heating service call. Found NTI wall hung boiler with indirect hot water tank. System off due to low pressure safety system; Error 108z Filled the boiler to 17 psi. System fired up. Opened up the system and showed the homeowner the heat exchanger and explained the need for an annual maintenance. He elected to sign up for EPP 1 heating and cooling. Waived diagnostic fee and explained office will reach out to schedule the heating maintenance.