No I don't think so. Why?
For a short while in the run up to the S30 code being permanent (in relation to any call for heat from the UFH) sometime I would notice that the heating hadn't come on and the boiler was showing S30. I could get it to fire up and start heating by turning the target...
The UFH is controlled with Heatmiser slimline panels in each room. I have reset all the units but the S30 code still shows when the thermostats are calling for heat.
Hot water is fine and the upstairs radiators (controlled with a wireless Honeywell thermostat) are coming on as normal.
I'm...