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The power supply unit didn't solve the problem, i decided to use a part from my duo300i from my hallway to see if that would fix it. I swapped the PCB controller from the Duo300i to the Duo400i and it worked briefly then showed what i think is an error code on the display (pictured) 5 red non...

Thanks, I have tracked it down with a continuity tester to the power supply unit PCB so i think i have had a similiar problem to yourself lillpete. I'm going to order a new part and see if it does the trick, the under side of the part had black scorch marks and a current wouldn't pass through so...

Hi, Does anyone know how i can diagnose a fault with my Dimplex DUO400i storage heater or suspect what the fault is most likely to be? Its 5 years old and won't switch on, i have tested the continuity of the wall switches 2 fuses, limit thermostat, over temp cutout, heating elements, and the pcb...