Hot water pressure -1

[markobel]

On my installation the sensor Heating Water Pressure mark always -1.
As my understanding from the code is because the reading get a non valid response.
It would be possible that on my boiler the data have a different MessageID ?
Or more simply my boiler doesn't send this value to the opentherm bus ?

[Chupaka]

Or more simply my boiler doesn't send this value to the opentherm bus ?

I vote this. E.g., my Bosch Gaz 6000 has only mechanical pressure sensor, so it cannot report pressure via OpenTherm.

[rsciriano]

Probably fixed by #52