Bosch Tankless Water Heater C1 C2 code

After trying to find a video to help me fix the C1 and C2 code I was experiencing with my Bosch tankless water heater and coming up empty, I decided to pull it apart and found a problem and wanted to share it for anyone in the same boat that I was.

[@travischristy8334]

Thanks, they are doable, but a pain. There may be an easier way to access them that someone might be able to share with us

[@highwind8124]

5:37 - I could barely see it. I was curious there. That's the first time I've ever seen a gas connector hooked to a tankless. CSST is bad. That's the lazy approach.
I was looking, thinking: "Does he have a drip leg?" No. That connector got a lot of strain at the ends to make those 90 bends. It's too short of a piece. It just needs a gas tech to put a union and drip leg on it. The crud in the pipe just goes up into that expensive unit otherwise.
Pretty damn good work, by the way.

[@alimahdavi01]

Good job! Hard to reach back screws

[@PaulGlander]

Having the same problem with my water heater. I removed the van, stuck a vacuum hose in there and gently blew compressed air backwards through the system. Cleared it out for now. Will see if its a long term solution. Do you happen to know if there are torque specs on all those screws? I couldnt find anything through bosch

[@p_dubya]

Had any problems with the error code
since you tried blowing the system out like this?

[@PaulGlander]

Actually yes it did come back. Worked for a while. I'm going to try doing a much more thorough blow cleaning and see if that helps. If not, a tear down may be in order