3Troubleshooting
Combustion Analysis Procedure
1.Turn the main power off to the boiler by placing the “On/Off” switch in the OFF position.
2.Remove the flue temperature sensor from the flue pipe connection. Note: Combustion measurements will be made at this point.
3.Turn the main power on to the boiler by placing the “On/Off” switch in the ON position.
4.Place the boiler into the active position by pressing the ENTER/RESET button on the display board (see page 7) until BLR:Standby appears in the display window.
5.Locate the pinhole button above the “T” in the Knight logo on the display board (see page 7). Press the button once and hold for 5 seconds to place the boiler into Service Mode. In Service Mode the boiler will fire at ignition speed and will then modulate up to full fire.
6.Insert the probe from a combustion analyzer into the hole left by the removal of the flue temperature sensor.
7.Once the boiler has modulated up to full fire, measure the combustion. The values should be in the range listed in Table 3H above. The CO levels should be less than 150 ppm for a properly installed unit.
If the combustion is not within the specified range, reference the chart below for possible causes and corrective actions.
Service Manual
Table 3H Flue Products
Natural Gas | Propane | ||
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CO2 | O2 | CO2 | O2 |
8.0% - 10% | 3.0% - 6.5% | 9.0% - 11% | 4.1% - 6.9% |
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8.Once the combustion analysis is complete, test the safety shutoff device by turning the manual shutoff valve to the OFF position and ensuring that the boiler shuts down and registers an alarm. Open the manual shutoff valve, reset the control, and return to Service Mode.
9.Turn the main power off to the boiler and replace the flue temperature sensor into the flue pipe connection.
10.Place the boiler back into normal operation.
You must replace the flue gas temperature WARNING sensor to prevent flue gas spillage into the room. Failure to comply could result in severe personal injury, death, or substantial
property damage.
Table 3G Troubleshooting Chart - Combustion Levels
POSSIBLE CAUSE | CORRECTIVE ACTION | |
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| • Refer to Section 3 - General Venting of the Knight Wall Mount Installation and Operation | |
Vent/Air Intake Length | Manual for the proper venting and air intake methods for the Knight wall mount boiler. | |
| or Obstruction | • Check for obstructions at the vent/air intake terminals. | |
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| Gas Supply Pressure | • Refer to Section 7 - Gas Connections of the Knight Wall Mount Installation and Operation | |
Manual for the proper gas supply for the Knight wall mount boiler. | ||
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| Dirty/Damaged Burner | • Refer to page 26 of this manual for burner removal and cleaning procedures. | |
• Replace burner if necessary. | ||
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| Gas Valve Adjustment | • Refer to page 41 of this manual for the gas valve adjustment procedure. | |
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