Bosch GWH 2400 ES NG Manual page 40

Troubleshooting
5. Lack of adequate gas pressure. Inadequate gas
pressure will cause the fuel-to-air mixture (CO
out of adjustment. This will result in unstable burner
flames and noise. Ensure gas pressure is in
accordance with specifications in section 3.12, page
24 Measuring Gas Pressure. A gas pressure reading
is needed to proceed further. Contact your original
installer or a local certified gas technician to obtain
this reading.
6. Verify proper CO readings per chapter 6.4, page
2
31. CO adjustments must be done by a certified
2
gas technician with a calibrated combustion gas
analyzer.
40
) to be
2
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