What does it mean? Can I sort this or do I need my engineer to come out? Is it safe? Or dangerous?
Just put in a couple of months ago - no problems till now just noticed radiators are cold - the blue light that's usually steady is on slow flash (mostly off, sometimes on) and the red "reset" light is flashing.
The thermostat is wireless and looks OK - it's signalling the little flame that means "firing" so the boiler should be burning.
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