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Worcester 42CDI CH symbol and CH green light flashing?

I have a Worcester 42 CDI the CH symbol and CH green light are flashing but the CH will not work.

The Water is OK, any ideas what the problem is?

Kevin
March 2014
WorcesterWorcester 42CDIHeating, Home Heating SystemsWorcester Heating Systems

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Worcester 42CDI: CH Light Flashing - No Heat