Hello, I’m looking for a solution to the Co2 adjustment height adjustment on a Webasto Thermo Top Evo5 RV. The described process in the workshop manual of the said heating unfortunately does not work, intended or unwanted by Webasto? The process is as follows: CO2 adjustment NOTE After the repair of the heater and the change of the dosing pump a check of the adjustment of the CO2 value should be done. The CO2 adjustment is carried out with Webasto Thermo Test PC-Diagnosis. On the factory side, the heater with a CO2 value is optimally adjusted for operation at heights between 0 and 1000m via NHN. A permanent operation above 1000m via NHN can lead to strong smoke and soot formation. In order to prevent a failure of the device and danger, an adjustment of the CO2 should be made in consultation with Webasto. NOTE The CO2 measurement and adjustment must be carried out in the heating device operating state full load (display in Webasto Thermo Test: Full Load). The CO2 value is corrected in the selection point 2.7.1. CO2 adjustment of the Webasto Thermo Test PC diagnosis. The CO2 content is measured about 20mm before the end of the exhaust gas outlet inside the exhaust pipe with a CO2 tester (e.g. MSI). The following table shows the nominal CO2 adjustment value in the combustion operation full load in the exhaust gas outlet. 8.3 Circulation pump The power consumption is approx. 12W at a nominal volume current of 450l/h. Fig. 802 Installation layers Circulation pump U4847 Econ Height [m over NHN] Nominal CO2 adjustment value at 20°C Ambient temperature [Vol.-%] 4kW 5kW 0 8,9 9,5 500 9,5 10,1 1000 10,0 10,7 The WTT V 3.8 diagnostic program breaks the heating and I go to CO2 measurement (under previous activation of heating operation approx.5 minutes), the process s ofort with flame rupture, or error off. — The control unit is not in the appropriate mode — see picture, I try it with start via Co2 measurement, I produce the message — the device is not in the corresponding mode— otherwise I could not find any way to get to the Co2 measurement, what do the full professionals mean among you, I see there what not, what could I do to solve the problem? Thank you in advance for EURE help!!!