Tankless service is usually flushing unless there is an ongoing performance issue. It begins with a visual inspection of the appliance and surrounding area. We inspect everything near the appliance including the gas piping, intake air & exhaust piping, condensate flow, plumbing and electrical connections. We are looking to prevent unnecessary emergency service calls. We will ensure there are no lingering gas odors, which could be caused by aging ignitor or incomplete combustion. We ensure there is no obstruction or blockage of the exhaust or air intake piping, i.e. no bugs, lint or leaves preventing air flow into or out of the unit preventing ignition. Ensure the condensate trap, neutralizer, pump, and discharge line are clean and free from kinks, debris, and blockage as this too could prevent ignition.  Inspect piping and fitting for signs of overheating or excess sweating, clean if needed.  Ensure wiring is clean and secure, look for exposed nicks or cuts. If applicable check control for set parameters and error history.  Next, we take the cover off and inspect in the cabinet. We hook up a submersible pump into a 5-gallon bucket of vinegar, connect the discharge hose from pump to the cold-water flush valve and a second hose from the hot flush valve back to the bucket of vinegar and open the valves. We begin flush and continue for 30 minutes. Then dump the vinegar and repeat with fresh vinegar for another 30 minutes. While flushing we inspect and replace the ignitor, flame sensor, gasket and sight glass and mounting plate.  We also clean out the dust and debris with a vacuum or compressed air.  Lastly if applicable we will remove, recycle, and replace the existing condensate media with new.