Unable to isolate 12v on MP-22S master panel - Dethleff

[Bustup15]

A few weeks ago the back lit LED to indicate 12v circuits active stopped working. A minor inconvenience as testing any of the lights showed if circuit was active or not.

Ive now just upgraded to lithium batteries and found that the 12v button as well as the indicator LED doesn't work although clicks in and out and sounds like it is working

The 12v circuits are all permanently live but it means I can't turn them off when van is parked up and not in use.

I did have all the wiring harness connectors unplugged when working on the batteries. (EBL etc)

Is the button failure timing a coincidence or related to the wiring harness reconnection (a bent pin on one of the connectors possibly?)

All other functions on the main panel are working correctly, battery gauges, solar charging, water pump, water tank levels etc

 

[autorouter]

You mention an EBL, is it a Schaudt Electroblock EBL, if so which model number is it? Worth checking the data connections between the EBL and the panel, maybe disconnect and re-insert them. It sounds like the latching relays that control the power on/off are not being controlled by the panel.

 

[Bustup15]

Yes it is an Electroblock, not sure of the model number off hand but that was also my thinking either the cable connections here or at the high voltage distribution unit fed to the over door panel.

 

[Bustup15]

Haven't had a chance to investigate this further but have had a price for a complete panel replacement.


635 euros

 

[jockaneezer]

If the panel is at fault, see if http://www.apuljackengineering.co.uk can repair it before you spend the big bucks on new ?

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[autorouter]

You need to find out what the fault is, or you may find that a new panel doesn't fix the fault. The trouble is it could be a fault in either the panel or the EBL, or the connection between them. There are two 'latching relays' in the EBL, one for the permanently on items like the fridge control board, frost protection valve, step etc, and the other for all the items that switch off from the panel 12V switch.

A latching relay is stable in either the on or off state, and requires a pulse to flip it from one state to the other. The pulse is commanded by the panel, but actually sent from a dedicated chip inside the EBL. So you can see that the fault could be in any of those places. Generally 80% or more of electrical faults are due to bad connections, but you may be one of the unlucky ones with a proper hardware fault.

Maybe someone like Apuljack will look at the fault if you send both the EBL and the panel.

 

[Bustup15]

I won't be replacing the panel until all avenues have been explored. As I said I suspect a bad connection but as we are just leaving for a few days in the van it can wait in case I make it worse