42 | Troubleshooting
Noisy burner/heater during operation
1. Sealed combustion leak. Make sure combustion cover is securely
fastened. Ensure the exhaust vent adaptor is properly sealed with
supplied gasket. Leaky seals create improper combustion resulting in
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 in accordance with specifications in
chapter4.3, page 11.
3. Lack of adequate combustion air. Drawing combustion air from a
room area of inadequate size will result in unstable burner flames and
noise. Improper piping of combustion air to the outside or insufficient
space will result in unstable burner flames and noise. Ensure
adequate combustion air is provided from the unit in accordance with
specifications in Section4.4, page 23 Combustion Air Requirements.
4. Cross contamination. Ensure that intake and exhaust terminations
maintain required clearances as stated in chapter 4.3, page 11. 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
) to be out of adjustment. This will result in unstable
burner flames and noise. Ensure gas pressure is in accordance with
specifications in Section 4.14, page 31 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
6. Verify proper CO
readings per chapter 7.5, page 37. CO
adjustments must be done by a certified gas technician with a
calibrated combustion gas analyzer.
6 720 644 887 (2013/02)
C 1210 ES/ESC