Re: Blinking red LED; C&K MD's

[Jim Rojas <jrojas@xxxxxxxxxxxx>]

chasbo@xxxxxxxxx wrote:
> Taking over old system containing C&K  DT435 and DT460S motion
> detectors.  Installed NX8E and connected the MD's.
>
> PROBLEM:  Red LED's on all of the MD's blink continuously every second
> or so.  Why? Pulsing continues long after power-up. Have powered
> down/up several times.
>
> Yellow and green LED's cycle on and off as their respective
> technologies are tripped, indicating to me that neither pir nor
> microwave have gone to sleep. Red LED's light after yellow and green
> LED's light, causing normal relay transfer.  All appears to be normal
> except that after the MD's reset, the red LED continues to flash every
> second or so, and never stop. System keypad green ready light
> extinguishes when there is movement, and lights when the MD's reset.
> indicating MD relays are functioning properly.
>
> I have read the 435 manual (do not have a 460S manual), but I did not
> see an explanation for the pulsing red LED.  Red LED's continue
> pulsing long after power-up.
>
> Brought two 640S to shop workbench.  Applied 12 volt battery, without
> charger. No pulsing red LED, even during power-up.  All LED's operate
> properly. Units perform perfectly.
>
> Anyone have an answer?

All the C&K dualtec motions work the same. The red flashing LED means
microwave failure.

Jim Rojas
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