Hello.
The question is how to connect the AD289 programmer / room thermostat to the De Dietrich MCA25 boiler?
The instructions for installing both devices are very poor and it is hard to find what and where to connect and whether to configure something in the oven or not.
However, after reading the manual, I connected the AD289 wall programmer to the OT output (there are OT-OT-Digit-Digit connectors on the programmer board) of the programmer on its board with a 2-core cable. I connected the other end of the cable to the OT connector on the back wall of the boiler display. Unfortunately, the connection does not work because the driver gives the error F203.
Urgent help is needed so that it works.
Second approach according to page 48 of the instruction manual, i.e. connecting the programmer on the OT connector to the circuit A connector on the furnace controller. Unfortunately, the result is the same, i.e. error F203 (no communication).
The question is how to connect the AD289 programmer / room thermostat to the De Dietrich MCA25 boiler?
The instructions for installing both devices are very poor and it is hard to find what and where to connect and whether to configure something in the oven or not.
However, after reading the manual, I connected the AD289 wall programmer to the OT output (there are OT-OT-Digit-Digit connectors on the programmer board) of the programmer on its board with a 2-core cable. I connected the other end of the cable to the OT connector on the back wall of the boiler display. Unfortunately, the connection does not work because the driver gives the error F203.
Urgent help is needed so that it works.
Second approach according to page 48 of the instruction manual, i.e. connecting the programmer on the OT connector to the circuit A connector on the furnace controller. Unfortunately, the result is the same, i.e. error F203 (no communication).
