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Managed to sort it now. Some of the radiators had been shut completely off and the one that is permanently on is only little, I guess the heat couldn't go anywhere. Turning them onto * seemed to bring it back to life after around 3 hours of being off. I will try the mains switch attempt when...

Switching the power on and off did nothing to get rid of the three lines. pressure is the same level as it's always been- only varies when the heater used to boot up. I'll give it another day or so and if it hasn't sorted itself out I'll give the estate agents a ring. Thanks :)

Hello, I have a 2 year old Ideal Isar He35 with itime programmer, which is anything but ideal. We tend to put the central heating on in short bursts. This time I got the fault L-9 and followed the manuals instructions to reset it with the select key. I have since been stuck with the screen...