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grant combi v3 heating problems

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swift

hi guys

ive got a grant combi v3 with low heat from hot water. central heating naturally convecting all the time. ive replaced the microswitch and the diverter valve, the hot water now is lovely and hot but after you have switched the hot tap off the central heating is naturally convecting heating up the rads. have checked with voltage pen that the microswitch is getting power. i have looked through the manufactures instructions on troubleshooting but nothing in there to do with this problem. any of you guys can shed any light on this problem?
 
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