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I have a OTGW connected between a ELGA heatpump and a Honeywell Vision Modulation. Now for the fifth time I lost the connection with the heatpump and its the same problem every time. The thermostat shows a temperature of 10.0 degrees and the heatpump won't start anymore. Every time they replace the ...

Thanks for the reaction, but I've found the problem.
They send me the wrong value for R3.
In stead of 220 ohm (red,red,brown), they send me 1200 ohm (brown,red,red).

Everything is working fine now.

Can someone explain to me dataID 128 (coming from Honeywell R8810A1018 Rf-Module)?

Henk.

I can't get my Otg to work . I only see messages coming from my thermostat. When I run the Delay symmetrytest from the diagnose software, I get an error on OK1a going from high to low. I've checked the opentherm interfaces as discribed, but nothing seems to be wrong. Can someone help me out. regards...