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It makes no odds where the DHW setting is , on or off the DHW will work , the DT20rf is designed to work with heat only boilers as well as the combi range Hass

Thanks John , if you pop your address in the envelope i'll send you a cheque for whatever your looking for Best Regards Hass

you leave the cap fully loosened ( about 2 turns ) at all times , the purpose of the auto air vent is ....erm ...well as it says its an auto air vent ,,,,,, it will purge any air from that point in the system , check also if additional AAV's have been fitted to the high points on the flow and...

I had a similar problem with a cb28 and changed both sensors without any improvement , it turned out to be sludge across the Heat Exchanger reducing the flow rate thus causing the boiler to lockout .... has the heating circuit been cleaned ? how old is the installation ? remove a downstairs rad...

As Slugbabydotcom says Isars are rubbish , even more so if the system is dirty .....was the system flushed and cleaned ? the rads might be new but the pipework isn't , as for the explosive ignition you really need a good ( technically minded ) engineer to sort the combustion settings out and set...

having a cuppa