This question is regarding Galaxy Boss 750s / 850s / 950s (Electric Shower) - Shower Spares

Boss B850S running cold

My Boss B850S is 13 years old. It now runs only cold and will not produce hot water. Do I need a new heater element? If so, do I also need a new cut-out, or is that included? Is it easy to fit? Is there an integral filter which could be blocked? Thanks for your help.
Asked 11 years ago by Anonymous

If the showeris absolutely cold then I think you may have a faulty Thermal Cut Out

A faulty TCO will have no continuity across the two terminals (Theblack thing on top of the heating tank)

Therefore agood TCO will have power at both connections and a faulty TCO will have power atonly one.

(The function of the TCO is, if thewater over heats it cuts the power off to the elements)

SeeVideo.

http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs

If there is some heat it may be a faultyelement in the heating tank (there are two, three in most 10kw showers) you cancheck them with a multi meter you should have a reading of around 12>18 ohms.

If you have power to the elements and noheat it's probably the elements, no power to the elements then it'sprobably a micro switch.

If you don’t have a multimeter we sell themat £10 each with a guide on how to use them for checking and testing the variousparts of your shower.

Apart from helping to fix your shower, theyare really useful for checking you have a power supply to appliances, forchecking fuses, letting you know much power you have left in batteries

(so you know if they aredud or not) and lots of other jobs, in short they are well worth the £10.

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester


I amoften asked “Is this a DIY job” to be honest I can’t answer that, becausewithout knowing someone, it isn’t possible to assess their skills?

Ishould say that most jobs on showers although relatively easy (from my point ofview) can be fiddly and an extra pair of hands, long thin fingers and thestrength in your hands of an all in wrestler are a help!

The secret is, observing very carefully when things are taken tobits, their order and orientation, taking notes and/or photos as you go can alsobe a help.

Whenyou are working with electricity and water so make sure it is switchedoff and turned off before you start.

If youthink you can do the job but aren’t just that confident, it may help to buy thepart and compare it to the faulty part, you will then be able to see where thescrews, wires, nuts, or washers etc. go, if then you think it is to complicated,at least you will have the part when the plumber or electricianarrives.

We will always be here to offer help and advice if you run into aproblem, however it is not the same as being on site where we canget the overhaul picture, if you are still not sure, now is the time to call ina professional.

There is no intergral filter.

Answered 11 years ago by Anonymous

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