As manager of Tech Services, it probably comes as no surprise I spend some time discussing fault codes and corresponding corrective actions. If there is only one thing you ever do, because I recommended you to do so, is this … GET A HONEYWELL KEYBOARD DISPLAY MODULE … it pinpoints the issue and saves hours of time. Read on here: Vinos Vine - Flame Safeguard Fault Code Diagnostics; Honeywell Trouble Shooting for TS boilers - Blinking Codes; Honeywell Trouble Shooting for TS boilers - Keyboard Display Module