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Ah Ok, sorry I misread. In this instance the thermostat is a Drayton Wiser. I will ask them if they support this call in their heat hub. The data looks much more sensible now in either case: 00000011/00001100, 90.00, 00000001/00000001, 0.00, 0.00, 0.00, 0/0, 18.00, 87.00, 1.40, 0.00, 0.00, 15.00, 79...

Ah! That could be the issue then! I didn't realise that if the boiler was not requesting outside temperature it would not be reported to the otmonitor Interestingly, running PS=1 reports a believable outside temperature tonight of about 7 degrees C....but my 1 wire sensor is actually inside currentl...

I've replaced the sensor and pull up hardware entirely, with no change in symptoms.

Not sure how best to debug this....is there any way to confirm if the PIC is trying to read from the sensor?

Hi I have the following setup: Opentherm Wifi interface v2.0 from nodoshop NodeMCU Firmware Version0.9.0+21bea01 (06-11-2021) OTGW PIC Firmware Version5.1 I have a DS18b20 with a 4k7 resistor pulling the data line to 5v The DS18b20 is on a 4m cable, with the pull-up at the PIC end The nodoShop silks...