Bosch AQUA STAR 2400E LP - Manual (Page 35)

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Troubleshooting
35
2. Improper venting. Venting that is unsealed, the wrong
material, too big in diameter or too long in run will
result in unstable burner flames and noise. Ensure
venting is correct and in accordance with
specifications in chapter 3.6.
3. Lack of adequate combustion air. Drawing
combustion air from a room area of inadequate size
or improper piping of combustion air from the outside
will result in unstable burner flames and noise.
Ensure adequate combustion air is provided to the
unit in accordance with specifications in Section 3.5
Combustion Air Requirements.
4. Cross contamination. Ensure that intake and exhaust
terminations maintain required clearances stated in
the manual. Cross contamination between intake and
exhaust may cause unstable burner flames and noise.
5. Lack of gas pressure. Inadequate gas pressure will
cause the fuel-to-air mixture (CO
2
) to be out of
adjustment. This will result in unstable burner flames
and noise. Ensure gas pressure is in accordance with
specifications in Section 3.8 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
2
readings per chapter 5.4. CO
2
adjustments must be done by a certified gas
technician with a calibrated combustion gas
analyzer.