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the CH send return is hot but its in combo mode at the moment as the ch tends to still work the dhw send pipe is cool shall i turn to dhw mode only and check the ch pipes to ensure it cools accordingly?

I did the steps it shows 49 I then switched the water back to boiler and it displayed 22 again

Vokera Linea 24 old! No DHW it only goes up to about 30deg on the display then flame goes out and repeats when in DHW only mode. -In ch mode the heating seems to work slightly better but still no DHW -It had an ignition pcb fitted last time it was serviced -I have swapped both...