I am a skilled professional that works for a Central Comfort company. I recently completed a job on a Viessmann natural gas hot water boiler with an indirect water heater. The boiler was installed in a commercial building and was not operating properly. I performed a thorough inspection of the unit and identified the issue as a faulty pressure switch. I replaced the pressure switch and tested the boiler to ensure it was operating correctly. I also performed a safety check of the unit and made sure all the connections were secure. The customer was very pleased with the work and thanked me for my expertise.