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pulsacoil water heater overheating?

I have a pulsacoil water heater at a flat that I use usually only once a week. I use very little hot water. Often the light on the front is flashing. Does this mean that it is overheating and what can I do about it?
Jean, September 2010
pulsacoil what ? 2000, III ETC.
how many times is the led flashing.
that will give an idea on the fault.

hi-spec plumbing & heating (essex), September 2010