Napoleon Auburn NPS40, Installation And Operating Insctructions

W415-0616 / E / 10.08.08

45

SYMPTOM

TEST SOLUTION

The auger motor is 

not functioning 

normally

Feed rate dial has 

no effect on the fire 

(timer control only)

The convection 

blower is not 

functioning 

normally

The heater will not 

operate when hot

-   Hopper lid must be closed.

-   Make certain the exhaust blower is operating.

-   Check the condition of the vacuum hose (located on the left side of the heater). Should not be cracked  

    or torn.

-   Check the manual reset button on the 200°F (93°C) temperature sensor. Before   re-setting the red 

    button, check for the cause of the over-heating. 

-   Check that the auger set screw is tight and not slipping.- If the auger still does not work, then apply 

    115V AC directly to the auger motor. If it still does not work, replace it.

-   Check the auger by bypassing the 200°F (93°) temperature sensor with a jumper wire. If auger works, 

    replace the sensor.

-   

The auger shaft may be jammed. For more information see “IN THE EVENT OF A JAMMED AUGER” 

    section.

-   Check the vacuum sensor by placing a jumper wire between the blue wire and the black wire that are 

    attached to the sensor.  If the auger works, test to see if the exhaust blower is producing enough 

    vacuum (may require cleaning).

-   If not, replace the vacuum sensor.

-   Secure all connections to the power control module.

-   Perform a resistance test to the potentiometer by placing the two test leads from a multi meter into the 

    leads of the potentiometer. The potentiometer should have a range of 850 KΩ (± 10%). 

Potentiometer readings:

    Full counter-clockwise (switched off) = open circuit, overload or infinite resistance

    Low fire .......... 900 KΩ to 1,050 KΩ 

    High fire ......... 56 KΩ to 62 KΩ

    If the range is not close or does not vary then replace the potentiometer.

-   Using the wiring diagram, compare all the connections between the controller, switch, and the 

    convection blower.

-   If the convection motor will not run, apply 115V AC to the motor directly. Replace the blower controller if 

    the motor runs. The convection blower has failed if the motor does not run. Replace the blower.

-   If the convection blower runs on high at all times (no control with the blower controller), check the 

    connections from the 160°F (71°C) sensor (located on the upper left side on the rear of the fire wall) and 

    convection blower controller to the blower. Disconnect one of the wires from the sensor and if control of 

    the convection blower returns to the blower controller, replace the sensor.

-   If the motor is still on high, re-connect the sensor and replace the convection blower controller.

General

-   Check the hopper for fuel.

-   Incorrect air damper setting may cause excessive air to consume the fire too quickly before the next 

    drop of fuel. Therefore leaving the fuel completely unburned in the burn pot and will cause the fuel to 

    burn cold and very slowly. Fuel also may build up and smother the fire. 

NOTE: The unit may require a change to the vent system or installation of fresh air to correct air to 

fuel ratio problems.

-   Combustion blower failure may occur because it is not turning fast enough to generate the proper 

    vacuum in the fire box. Do a visual check to see if the motor is turning.

-   Check vacuum levels in the exhaust channel by bypassing the vacuum switch, then remove the vacuum 

    hose from vacuum switch. When checking the vacuum exhaust place the open end of the vacuum hose 

    on the gauge (readings must be above 0.10" W.C. on low fire). 

NOTE: if the motor fails to reach a 0.10" W.C., then replace the combustion blower.

-   Poor quality fuel may not produce enough heat to keep the stove burning or operational.

-   If the exhaust temperature sensor fails try bypassing the sensor located on the exhaust blower. If the 

    stove operates properly, the unit may require cleaning or a new sensor. Contact your local deal for 

    service.

-   Unplug the stove, open the left side panel and jump the two brown leads that are attached to the 140°F 

    (60°C) temperature sensor. If the stove operates replace the 140°F (60°C) sensor. 

TP - PEllET TROUblE ShOOTING 2