I had tis fault on my boiler. Spoke to ideal and they told me it needed a new PCB. On later inspection, it was the overheat thermostat. Change that first for £8 rather than a PCB for £240
Ideal Mexico HE 36 fault code H5
- Thread starter Wayne10968
- Start date
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Well done 
And bad luck on having a "FLoorstanding ICOS/ISAR!!!
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They make more profit by telling you that!
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