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Hmm I faired that would be the case... I guess ill have to find a replacement then...

Thanks again for your in help!

Best

Maarten

It is with both boiler and thermostat added. I measured the voltage (0.64v) on the pins of the chip themselves (just repeated it while running the diagnostic test). When I connect only thermostat the same happens.

I am sorry that cannot provide more information.

cheers,

Ok I loaded the diagnostic firmware on the OTGW and I get:
Thermostat: 0.00
Boiler: 3.51
Reference: 1.22

Am I right in saying that the A/D converter indeed is not working correctly?

Cheers,

Maarten

Thanks again for all your help! Great to get such good advice! I issued the command and it reported DP=00 every time. measuring PIN 17 show 0.64volts and on my scope I see that there is a signal (from the thermostat?) but it is quite low (see attached). do you think there something wrong one of the ...

Oke so boiler messages are logged again: 13:02:44.293108 ÿOpenTherm Gateway 4.2.5 13:02:44.317454 Thermostat disconnected 13:02:45.261488 R80000100 Read-Data Status: 00000001 00000000 13:02:45.353018 B4000010C Read-Ack Status: 00000001 00001100 13:02:46.300268 R80190000 Read-Data Boiler water temper...

Sorry for the late reply, i've found some time to check the logs after resetting the gateway: 11:32:00.182930 ÿOpenTherm Gateway 4.2.5 11:32:00.210047 Thermostat disconnected Other than that I don't get anything.. It seems it also does not communicate with the boiler now (as it did properly before :...

Thank for the reply! I'm sorry for the confusion, it seems I was wrong about the voltage measured on pin 18. It seems actually to be fine. I measured the voltage drop on pin 17 when I connect pin 2 to VDD. It seems to drop from 2.12v to 0.76v. If there is any mixup in resistors it was then already o...

i've done some more power tests. The current between the terminals of the thermostat port is about 7mA and if i connect pin 3 of the IC1 socket to ground (e.g. pin 5), the current between the two terminals is about 19mA. With thermostat and boiler connected to each other I get 17.2V between the term...

Hi all, Last weekend I assembled the Wifi OTGW board from nodo-shop.nl. I have it connected using the NodeMCU and I am able to receive information from the boiler (Remeha Tzerra). However the iSense thermostat give the f203 error (and the backlight does not work). when I connect only the iSense to t...