Questions about Eberspacher D3L Compact control panel

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eddystone

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My control panel is just a rocker on/off switch with rotary thermostat setting and red and green pilot lights. The red and green LEDs come on when it is switched on and stay on until it is switched off. The last couple of times the green light is either very faint or not on at all but the unit still works (although last time seemed a bit slow to heat up). Could this just be a defective LED rather than a fault with the heater?
 
eddystone said:
My control panel is just a rocker on/off switch with rotary thermostat setting and red and green pilot lights. The red and green LEDs come on when it is switched on and stay on until it is switched off. The last couple of times the green light is either very faint or not on at all but the unit still works (although last time seemed a bit slow to heat up). Could this just be a defective LED rather than a fault with the heater?
Click to expand...

Do you have this controller, possibly without the vent position on the rocker? If so and Roy's circuit diagram correction is correct (he usually is correct!), the green LED is in the simplest of circuits between the switched 12V input and 0V via a simple diode and 2.2k resistor. The green LED should therefore be permanently on if the 12V is switched on and the 0V connection is good.. (Of course, if you have a different controller - forget my post and describe the one you have).
Diagnosing step-by-step, firstly, I would disconnect and remove the unit and connect just +12V and 0V and switch on to test the green LED circuit. If the green LED fails to display at normal brightness, there is most likely a faulty component (Green LED, D3 or R1).

Ebers Temp.jpg

Cheers
Bob
 
Agree with Eddystone. Most likely a cosmetic problem like dry soldering or dying LED in the indicator circuit. Low voltage or fault somewhere in the control circuitry would stop the heater working completely. If you can live with the dim LED, it is probably best to do just that ;-).
 
QUOTE="jiris, post: 7022718, member: 151123"]
Agree with Eddystone. Most likely a cosmetic problem like dry soldering or dying LED in the indicator circuit. Low voltage or fault somewhere in the control circuitry would stop the heater working completely. If you can live with the dim LED, it is probably best to do just that ;-).
[/QUOTE]
Agreed.
(If you want to take it further, have a look at the Letonk website and see if you can identify the exact device - Controllers were not Ebers finest hour)
Controllers 3
Cheers
Bob
 
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