Hello everyone. I am new to this forum and hope someone can help. I have a 6 month old oil fired Grant vortex pro external combi 26 boiler. We have only recently fully turned off the heating and as a result are now not getting any hot water once the thermal store water is used up. I have a dual hw and heating programmer which was used with the old boiler though the hot water function was never used and we used to get direct hot water with no problem. Now however the dhw pump doesn't seem to trigger firing of the burner so i can only get hot water if the heating is turned on. Any suggestions for how to fix this greatly appreciated! Thanks. Dave.
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Dhw pump not firing burner
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