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Having problems with Vokera 28 linea boiler - hot water off and on?

My problem is that my vokera 28 linea boiler is playing up. When you put on the hot tap the water comes out very hot to start with then cuts out and becomes stone cold before gaining the heat steadily until again it suddenly drops. The boiler itself seems to cut out at a certain temperature when the water is on. Although the water temperature at the boiler is set at about 40c the actual temp of water that initially comes out of the taps is much higher. We've had an engineer out to this, the boiler has been thoroughly serviced and the main heat exchanger cleaned but still the problem is persisting. Engineer thinks that maybe the main PCB or the thermostat is the problem but not 100% sure. Any advice would be greatly received.
vonni, July 2008
thanks for the advice the boiler is now working again.

vonni, August 2008
check that the temp control knob spindle has not
broken off where it passes through the display pcb

jason, July 2008
i would ahve assumed the dhw (plate to plate) heat exchanger is scaled up, on either the primary or secondary side (or both!) and may need replacing....

your engineer (i use the term loosely!) should know this

T, July 2008
link Click here to see other fixes for Vokera.