Indicator Hot water

Screwed up old plumbing?
My house is old, my plumbings old, but there seems to be an extremely weird problem. Can somebody tell me if there is a logical cause for this?
Every time in the middle of my shower, the water turns suddenly hot. The water temperature indicator thingy is not changed, I know this because all the water is not changing hot, but the cold water stops coming and its all hot water. Is there a reason that it happens randomly in the middle of usage?
It would have to be a toilet! Water is slowly draining into bowl and and when back tank gets low it has to refill itself. To check this you simply put a drop or two of food colouring into bowl, then leave it for a while to see if it runs clear. This happens in many homes without any one noticing!
What Is Home Water Conservation: Residential Tips on Video : Checking the Water Meter Flow Indicator: Home Water Conservation Tips
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The red light is flashing (Fast Flash - 5 per secnd) on the hot water indicator for my Worcester 24cdi boiler?
The red light is flashing on the hot water indicator (D.H.W Demand Indicator) for my boiler which is a Worcester 24 cdi. The Hot water and the central heating are both not working. Any advice of what checks i could make before calling out for a plumber ?
Thanks
According to this: http://www.worcester-bosch.co.uk/cache/file/186/user-instructions---customer-care-guide.pdf
... it is:
"Air flow fault (RSF). Flue gas spillage"
I feel confident you should call a serviceman (engineer).
On edit:
Lots of potential causes: bad combustion fan; faulty pressure switch; bad spill switch; blocked/damaged flue; inadequate make-up air.
This isn't a common error that will have a simple fix.
.
Regards.


















