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Thanks for your suggestions. I contacted Theo and he was very prompt and helpful in the possible supply of spare parts for my QHY9. However, with further testing I found that the problem was a faulty connection of the TEC cooling controller to its 12 volt power supply. I had made the mistake of having this connection permantly patched up for a prolonged period at my mount. A simple clean with electronic cleaning fluid fixed the problem - lesson learnt!
Peter
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