2014 Symbol 230v outlet problem

The 3 MCBs in my 2014 Symbol have NOT tripped but MCB 2 appears to have failed.  The Space Heater is not working together with the 2 outlets on the same circuit.  MCB 1 (primary 230v outlets) and MCB 3 (12v charger) appear to be working ok.  Any advice appreciated.  Thanks - Daves

On most Sargent PSUs there are two 9 pin outlet plugs into the bottom of the unit. One plug may have worked loose, wiggle them, may help.(power off)

MCBs rarely fail in my experience. It’s more likely to be a connection problem somewhere. The 230Vac supply from the PSU is connected to the loads via a 9way connector and a wiring harness, so this is the first thing to check as Ploughlin advises. The age of your van is similar to ours, in which case you may well have an EC155 PSU and the 230V wiring harness will be as shown in the link below.  This may help you to check the continuity between the PSU, the heater and the relevant socket outlets.

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If you had said it was just the heater that wasn’t working then I’d have suggested you check the fused spur that supplies it, in case it’s been switched off.  However the fact that your sockets fed by the same MCB are also not working indicates the problem is nearer to the PSU.

Unless you’re competent with 230V systems I would suggest you check continuity with a multimeter and with the PSU powered down.  If you’re unable to progress beyond that level of checking then turn to a professional electrician.

Tim

Many thanks for your replies.  As part of winterising, my van is permanently hooked up and a small oil-filled heater set on low from one of 2 outlets under the offside bed.  I check it weekly but today find the heater is not working.  It works ok from 2 other outlets which I guess are supplied via MCB 1.  I also turned the space heater on electric but that didn’t work either.  I’ll check out the system as you suggest.  No evidence of vermin but I guess if a mouse had got in there behind the PSU, and chewed the supply, the MCB would have tripped?
Thanks - Daves