I have a Glow Worm Ultracom 30sxi boiler that provides central heating and also heats a hot water tank. There are no error codes shown on the boiler but recently the hot water has stopped working. If I try and change the temperature under the tap symbol, it just displays 'no'.
The boiler is connected to a Honeywell controller with set times for hot water, central heating etc. It seems like the boiler has lost connection with the control unit - if I put the hot water onto continuous it has no effect. Presumably this is to do with the 'No' message? Has anyone else come across this? Thanks for any help in advance.


The boiler is connected to a Honeywell controller with set times for hot water, central heating etc. It seems like the boiler has lost connection with the control unit - if I put the hot water onto continuous it has no effect. Presumably this is to do with the 'No' message? Has anyone else come across this? Thanks for any help in advance.

