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S30 means it is in standby.
Do you have a wired or wireless stat?
If it has been removed then how do you trun the heating on usually?
Ok, you also have a hot water or heating position control knob. Can you confirm what happens when you turn it to off and back again?
The hot water is ok?
When you turn onto heating also, does the display change and the pump start?
What is the pressure gauge reading?