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Yes it was a on/off thermostat. I have changed it with a Honeywell round modulation now. I thought first that my thermostat was a honeywell round modulation because we had changed four years ago the boiler and the thermostat, that is why i was pretty sure that i had a opentherm thermostat. Everythin...

Thank you for your hulp, I'm going to try it with a other thermostat(Letting my parents buy a new one ).

Oke i have done the test, this are the results from the first test, i have removed adittional resistors and i use a new Multimeter because the other wasn't working well. I suggest you check the voltage on X1 and pin 17 in 3 situations: No thermostat connected: Expected values 25V and 3V. Result: PIN...

Ow, sorry for that, i was forgotten to tell that i have added a 14K resistor parallel to R6 to let pin 17 of IC1 drop down to 3V. Without the 14k resistor pin 17 is 3.89V. The R5 is 32K, i didn't write it right, sorry for that. I will do the checks that you recommended me, i let you no what the resu...

Pin 17 gives still 3V with thermostat connect to the gateway, is there away to solve it, because it doesn't detect my thermostat.

Kind regards,

Malek Sediqi

Oke pin 17 was 0V because the 100K was wrong placed. I have checked again pin 17 and it is still 3.89V,the R5 is still 32K and the R6 paralle with 100K is dropped to 4.4K ohm.

I have added the 100k parrallel to R6 drive.google.com/file/d/0B3Mgf9SlnCcoc3 ... sp=sharing . The gateway didn't print out the disconnect and connect but it still doesn't connect with the thermostat. I have changed the preference voltage and it still doesn't recognized the thermostat. The voltage o...

Thank you for the reply, I have checkt the wires between the gateway and thermostat and i have changed the wires and it didn't help. I have checkt the R5 and R6 and the R5 has 30K ohm and R6 is 4.6k ohm. I did again the test of the OTGW website and one thing was wrong and that is this test : Measure...

I'am working for a school project to make a opentherm gateway. I have solder the opentherm gateway and i have tested the gateway. I have connected the opentherm gateway with the boiler and the thermostat(Honeywell Round Modulation). I get the data from the boiler but the thermostat is disconnected a...

Solved optocoupler was wrong placed. Now i get 6V.

the links of the pictures weren't working. drive.google.com/file/d/0B3Mgf9SlnCcoaz ... sp=sharing drive.google.com/file/d/0B3Mgf9SlnCcoMG ... sp=sharing I have checked everything but i can't find the problem. I have connected it with my laptop and i'm receiving R0000000 in OTmonitor and if i connect...

Hello, I have bought an opentherm gateway from the kiwi website. I have changed the trafo and the 7805, because i wanted to use a esp8266. The changes that were made were recommended in this forum. This are the parts that i have added: EI 30/15,5 printtransformator VB 2 VA Primair: 230 V Secundair: ...