I bought a Hymer motorhome recently with this fitted in the roof (400mm square hole). It did not work when I bought the motorhome but thought I may be able to fix it. I changed the capacitors but it made no difference, the ventilation fan feels very stiff so may be seized. The refrigeration side though works great and the pipes get frosty cold very quickly. It also had the invertor fitted to allow it to cool when travelling. I could just throw it away but thought it may be useful for spares for someone. Obviously the invertor could be used as .... well an invertor. Would like to get £100 for it.
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