Upon arrival spoke with customer. Boiler going through a hard lockout. Had customer try and reset boiler prior to my arrival. Boiler was still in a hard lockout while on site, set boiler in contractor mode. Went through error history and all parameters in boiler setting. Ran boiler in test mode. Boiler fired up and ran. Manually reset boiler. Remove and clean flame sensor flame/flame rod. Re-installed and ran boiler. Boiler is on/running check all operation. Boiler ran in domestic mode and satisfied. Once boiler shut down after storage tank was filled to provide customer with hot water. Had boiler run for heat. Checked multiple heating zone to be operating normally. System is back up and running again for normal operations. Recommended to customer to follow up with heating maintenance. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-7C6F-352456608E3C4A5188E2580315787AFC