Naim NAP 500 fan running full speed

Hi-Fi Corner
1

The fan in my NAP 500 just started running full speed at idle and has not stopped since a few days.

I have turned it off each evening but the fan stays on every time it’s powered up.

Can I do anything or does it have to be repaired?

Thanks Chris

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Seems it needs repair. Have you left it unpowered over night (understand that you did). So you might have done all you can.

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Chris is it actually getting hot or is the fan just coming on regardless?

Maybe @NeilS has an idea here?

1 Like
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Does it still run with the inputs & speaker cables disconnected?

Regards

Neil.

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Hi folks,

This happened to one of my best customers last year. In his case, the amp had plenty of ventilation and was not being driven hard whatsoever. The problem seemed to have something to do with the sensors being activated. I had assumed the amps only had thermal sensors, but I was told this was not the case, they also had sensors for other conditions- presumably line voltage. In his case, the problem was intermittent. Sometimes the amp would be fine after a period of no use, and sometimes the fans would go to full speed as soon as the amp was powered up. This went on for some time, but eventually the team at Focal Naim North American in the repair department were able to solve the problem. As for what the exact condition they isolated, I was never clear about that, but they did effect a successful repair, which was all that mattered to me.

Good luck,

Bruce

3 Likes
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Interesting - I wonder what Voltage would trigger the fan in a Naim amp. Presumably a significant spike would be needed. In the UK the authorities are struggling to balance the grid and over-Voltage is the norm for many, but we are taking about it running at maybe 250 to 260V instead of a nominal 230, as opposed to spikes at a much higher level.

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The DC rectification happens in the power supply though. Assuming it’s functioning correctly, it won’t impact the head unit. Could cause a transformer to hum though.

Though I wouldn’t rule out a problem with the power supply with the the head unit being a symptom not the cause.

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Hi Richard and Niel

no high temperature- it stays on from when it’s turned on until it’s turned off. With music or no music..

I have not tried disconnecting the inputs and speakers, but will try this. It’s not so easy to move in the rack.

Cheers Chris

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