I had same error on my second IP4600, "6C10 - Condition: The valve cam sensor was faulty at power-on or when purging was attempted".
It was really hard to get access to sensor, take it out and put it back. I still do not know what was the cause, as the sensor - a simple mechanical contact - was ok. However, after that I had only once the error, related to cold weather.
It was really hard to get access to sensor, take it out and put it back. I still do not know what was the cause, as the sensor - a simple mechanical contact - was ok. However, after that I had only once the error, related to cold weather.