Ideal Isar HE24 L:F flashing

Hi Guys

I have an Ideal Isar boiler model HE24 and it is pretty old, but so far was working just fine. Today morning I realized there is neither heating nor hot water at home. Boiler displays L:F message. What does it mean? How to fix it fast? What is better (cost) fixing issue yourself or calling customer service?


Hi Josh

Looks like overheating fault. If I were you I would start with resetting the boiler- to to this press D button and wait for couple of seconds, boiler should restart. If it restarts and everything works fine- your problem is solved and it is definitely cheapest solution. If not call Gas Safe Engineer from your area, overheating components shouldn’t be replaced by anyone without proper qualifications.