Hi,

The photo here is one of a pair of Eppindorf 5415D centrifuges. http://easthope.ca/Eppindorf5415D.jpg

This morning both machines failed to operate. No response when the
main power switch is flipped on. Empty display. No power indicator
light. Fuses are OK.

The machines are in separate rooms. There is power at the receptacles
they connect to. No other equipment is failing.

Ideas?

Thanks, ... P.

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Same age? Close serial numbers?

As to power - did you plug in another piece of equipment, or just check with some sort of tester? If the neutral is out, you may have "power", but not usable power.

Suggestions in no particular order:

a) Find the main panel that feeds those circuits and the individual breaker(s). Cycle them.
b) Move the machines to another known-good receptacle.
c) Check the power cords. If they are not hard-wired, try removing/plugging back in.
d) Check the lid interlock(s). If they are sticking, the machines will not start. In the case of some of the machines here, they will not even light up if the interlock is not either fully open or fully engaged.
e) Replace the fuses anyway. They get tired and may not show as blown, but may still be open.

Good Luck!

Peter Wieck
Melrose Park, PA

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On 11/22/2023 5:05 PM, peter@easthope.ca wrote:

[...]
The machines are in separate rooms. There is power at the receptacles
they connect to. No other equipment is failing.

"Separate rooms"!! That is truly confounding. Ordinarily, the 2 rooms situation would imply 2 power circuits (breakers). But with identical, spontaneous failures of both machines, they are _most likely_ on the
same circuit. So the breaker is tripped, or defective.

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On 22 Nov 2023 15:05:09 -0700, peter@easthope.ca wrote:

Hi,

The photo here is one of a pair of Eppindorf 5415D centrifuges. >http://easthope.ca/Eppindorf5415D.jpg

This morning both machines failed to operate. No response when the
main power switch is flipped on. Empty display. No power indicator
light. Fuses are OK.

The machines are in separate rooms. There is power at the receptacles
they connect to. No other equipment is failing.

Ideas?

Thanks, ... P.

If mains is truly not to blame, I suggest that the 'failure' is
not simultaneous - just that you noticed both not working for
the first time.

Gremlins killed unit #1. Unit #2 was then used till IT failed.

... then you came in . . . .

RL

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On Wednesday, November 22, 2023 at 3:05:15 PM UTC-8, pe...@easthope.ca wrote:

Hi,

The photo here is one of a pair of Eppindorf 5415D centrifuges. http://easthope.ca/Eppindorf5415D.jpg

This morning both machines failed to operate. .... Fuses are OK.

Open 'em up and look for more fuses. There are modular
parts in many appliances, and the main fuse might be slower
or less sensitive than the fuse in one of the modules.
I've seen three fuses in series, and 'fusible resistors', reset-button
circuit breakers... safety consideration can get excessive.

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