Hopefully fixed now, we'll find out tonight (see my other post), but you raise some interesting points.

On Thursday, April 19, 2012 4:57:03 PM UTC+1, js.b1 wrote:
On Apr 19, 4:42*pm, alamaison wrote:
One of our storage heaters, an Elnur SH24A, has stopped charging

24kWhr, 13A supply so 15A fuse or 16A/20A MCB/RCBO at the CU.

15A rewireable fuse though I've been contemplating an new CU with RCD for the storage heaters.

All the heaters in this house have their flex wired into *fused* switched spurs with a 13A fuse but browsing a copy of the regs from 1984 last night (as you do) I saw a paragraph saying that 3.4kW heaters should not be fused other than at the CU. Yet these heaters have worked fine for decades. Who is right, the (ancient) regs or the (equally ancient) original installer?

It was new this year so I hope it's just the thermal cutout that's
triggered (no idea why). *Does anyone know how to reset one of these?

Do all the other storage heaters work?
DNO Teleswitch black boxes can rarely fail (on or off).

Is power getting to the heater at the correct time?

The other heaters work fine and the neon on this ones switch was lighting up. But now you mention the teleswitch, we have noticed some very strange behaviour since I installed a neon to actually see when the heaters come on. We thought the teleswitch would be activated around midnight and deactivated around 8am. Yet our teleswitch seems to go a bit freestyle. Sometimes it comes on mid afternoon. And stays on. All night.

A) Is this expected behaviour or is our switch broken?
B) The rating plate on the heater says Max charge time 7hrs. Is this indicating how long it takes to fully charge or actually telling us the maximum it is *allowed* to charge? If the latter, could the strange teleswitch behaviour have overloaded the heater causing it to trip?

Any help greatly appreciated (and will save me about £350).

Elnur probably have a fixed call out service for £70-90, maybe parts
on top.

I gave Elnur a call and they helped me with my nipple problem. I highly recommend Elnur. The first person to answer the phone was clearly an engineer. How often do you get that?!