Arrived onsite to customers request of taking a look at his venting which was cleaning flue gases. Supply house is going to get back to me on pricing and availability on material, once this is done I will send customer a quote via email. He also wanted me to check the ignition on his boiler due to some hard ignition that has taken place at random times. Was not able to recreate this issue while onsite. Performed combustion analysis on boiler, co2 was 5.8%, o2 was 10.5 % co was 200 ppm. According to manual this unit needs between, 5-9% co2 it did not specify o2, and the co should be no more than 400 ppm. Inspected burners, combustion chamber, heat exchanger, pilot assembly. Did not find these areas to be dirty. Wasn’t able to find issue with ignition. Thank you for choosing CPI Plumbing and Heating Inc.