One of our storage heaters, an Elnur SH24A, has stopped charging. 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?

The only switch i've found that measures a high resistance (20 Ohms) accross it is a small beige cylinder with a little reddy-orange 'nipple' on it. The nipple is slightly moveable and I've tried tweaking it a bit (cue toilet humour) but the resistance stay stubbornly high. According to the wiring diagram, it is in the right place for the safety switch (Ts).

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

Turns out I just didn't tweak it hard enough. Needed a good poke to reset.

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.


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).

Has the MCB/RCBO/RCD tripped?

Is power getting to the heater at the correct time?
A switch with a neon is preferable for a storage heater.

Are the connections sound in both the switch & storage heater?
Obviously you need to isolate at the CU first.


The only switch i've found that measures a high resistance (20 Ohms)
accross it is a small beige cylinder with a little reddy-orange 'nipple' on it.
The nipple is slightly moveable and I've tried tweaking it a bit (cue toilet
humour) but the resistance stay stubbornly high. *According to the wiring
diagram, it is in the right place for the safety switch (Ts).

Mmmm, 20ohms is about right for 4 elements, 13A, 24kWhr storage.
Thermal fuses are replace only, thermal trips are "push plunger back
down".


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.

On Apr 19, 4:56*pm, alamaison wrote:
Turns out I just didn't tweak it hard enough. *Needed a good poke to reset.

I have a vague recollection of some incorrect thermal trips on a few
heaters.
Pretty sure it was Creda, but the part may be common (STL make Creda).

If it trips again, telephone Elnur UK and see what they say.

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?!

What fuse do I use in the fuse spare for the elmur RF 12P

wrote:

elmur RF 12P

Any heater worthy of the name is going to want a 13A fuse, yours seems
to be 1500 Watts, is there any reason it should have blown the fuse?

https://www.elnur.co.uk/wp-content/uploads/2016/03/rf-range-user-manual.pdf

I've never had any storage heater blow a fuse. I don't see how the thing can
short out the elemement is quite big.
Brian

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This newsgroup posting comes to you directly from...
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"Andy Burns" wrote in message
...
wrote:

elmur RF 12P

Any heater worthy of the name is going to want a 13A fuse, yours seems to
be 1500 Watts, is there any reason it should have blown the fuse?

https://www.elnur.co.uk/wp-content/uploads/2016/03/rf-range-user-manual.pdf

Brian Gaff wrote

I've never had any storage heater blow a fuse. I don't see how the thing
can short out the elemement is quite big.

It doesn’t just have elements, there are obviously wires to
them that can come adrift and usually a fan and switches.

"Andy Burns" wrote in message
...
wrote:

elmur RF 12P

Any heater worthy of the name is going to want a 13A fuse, yours seems to
be 1500 Watts, is there any reason it should have blown the fuse?

https://www.elnur.co.uk/wp-content/uploads/2016/03/rf-range-user-manual.pdf