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There is a board protection fuse and a fuse before the circuit board where the mains cable enters the Boiler. However, if any of these fuses have blown then there most probably has been a component failure, like the Pump, Gas valve or the Fan, any one of these could have blown a fuse and need...

I had this problem with a Flexicom, when the cold was turned off the boiler would start its hot water demand sequence right up to the point of opening the gas valve before shutting down, thus causing explosive ignition the next time it was used. The fault was found to be low water pressure to...

I am assuming that the installation is now fully pumped with room and cylinder thermostats and a twin channel programmer. If this is the case then I would leave the hot water on from morning untill evening, this is because if water is drawn from the cylinder it is replaced with cold and will...

Divertor valve requires relacing, a pig of a job on the old style CDi's. Expect to pay for about 1-1/2 Hrs labour (on a good day) plus parts costs of about £100. Please do not be tempted to DIY, even experienced engineers fall foul of this beast.