Storage Heaters

I have been asked for ideas about a heater not working. (not been to look yet). How are they normally connected - are they on individually fused radial circuits - or are they on a ring? I want to get an idea of whether I am going to be looking for fused spur outlets - or a fusebox. The 'all-electric' property is about 12 years old.
The heater is a http://www.heatstore.co.uk/downloads/HSXAF_N_Inst-Issue6.pdf
The wiring diagram isn't very clear - can't decide if there is a user re-settable cut-out.
Anyone experienced with these?
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On Sat, 06 Jan 2007 09:42:07 GMT someone who may be "John"

Each heater should be fed by a dedicated radial circuit from the off-peak board (or the off-peak section of a combined board). The fixed wiring should terminate in a switch near the heater, from which heat resisting cable should go into the heater.
The protective device at the board may have operated. If there is switched fused outlet instead of a switch then the fuse there may have operated. The heater may also have overheated for some reason (usually being obstructed) and needs to be reset.
Other than the smallest sizes such heaters have multiple elements, so the failure of an element will not cause total failure (though it may be that the elements have failed one by one).
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David Hansen, Edinburgh
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David Hansen wrote:

The link provided by the OP shows the heater to be of the type with a separate fan/boost section, so there there should be two independent electrical supply connections - a switched off-peak supply as above plus a permanent supply for the 1.5 kW fan/boost side.
The OP needs to be clear which side isn't working (failure of both sides is unlikely as they are electrically quite separate).

The last of those is the most common problem. The circuit diagram in the instructions show two bi-metal devices in series on the off-peak side, one is the normal user input charge control and the other is an overheat cut-out. Sometimes the latter needs to be manually reset, sometimes it's a non-resettable thermal fuse type of device that needs to be replaced. As this is a critical safety component only an official spare part should be used (and definitely no bodging by leaving it shorted it out).
The fan/boost side seems to to have two cut-outs, each associated with one half of a twin-bank heating element. The are fed via a room stat and the fan and boost switches.
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Andy

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