A licensed technician should replace any sensitive elements, such as the electronic board or gas valve.No can do on the 1004. If all the above issues are corrected, and the unit is still not operating per specs., the problem might be with the PC electric board and/or gas valve, requiring their replacement.Make sure that the heat exchanger (and space between fins) is clean from debris and dirt, so as the gas burner - to prevent irregular combustion.Check for the proper drainage of the condensate (condensing type).Check for water leaking and excessive moisture as it can lead to corrosion and wet electrical connections.Proper dip switch and gas pressure set up for the high altitude installations.Check the venting system (both intake and exhaust) for blockage.For example, incomplete combustion (not enough fresh air or blockage) leads to incomplete combustion (yellow/red flame instead of blue) and carbon buildup on the flame rods. Always look for the manufacturer's instructions for the correct vent installation, the recommended material, size, length, and proper clearance around the vent.
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