Vauxhall Astra heater issues - what's causing it?

The heater fan has stopped working on my Astra. It started out only working on setting 4 but has recently given up completely. I've tried changing the resistor it briefly worked but again stopped. Any ideas?

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It's the same fault and same 'cure' that has been causing the Zafira to catch fire. The fault is probably water getting into the fan motor with the result that it will only work on max. Get the fan motor checked and check for water leaks from a badly fitted replacement windscreen or flooded bulkhead vent well. Do not under any circumstances bridge or fit a higher rated fuse to the resistor or the car wiring could catch fire.
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