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No external frost stat installed plus boiler sitting around 15 degrees so built in frost protect not activated (5 degree). Checked all the supplies/connections in sequence and all functioning properly and sending voltage in sequence from the wiring centre etc. Honestly thinking the PCB however...

Our Ideal Logic H18 constantly cycles every 5/10 mins during the night with no heating or hot water demand from our Danfoss TP1 programmer. Originally thought the boiler was dry cycling however thinking the cylinder stat could be kicking the boiler in and out despite the programmer not calling...