Troubleshooting - USSC 5660 Installation And Operating Manual

The heater will not light:
 Check that the heater is plugged in and that the wall outlet has power.
 Unplug the unit then check all electrical connections against the Wiring Diagram in this manual.
 Check the fuse on the circuit board.
 If a thermostat is used, ensure it is calling for heat.
 If your heater still does not light, contact your local dealer for service.
The heater will not operate when hot.
 Check that the fuel hopper has enough pellets.
 Check that the combustion air inlet is not blocked. Insufficient air supply may cause the fire to burn
cold and may cause fuel build up, in the pot, and smother the fire.
 Check that the exhaust fan is operating. If the fan is not operating properly, it may not generate
enough vacuum in the firebox.
 Check the 200°F high limit switch. This switch is manually reset. Check if it has tripped. If so, let cool
and reset switch. Check for cause of overheating. If switch trips again, contact your local dealer for
service
 Check the vacuum switch by shorting out the vacuum switch then depress ON/OFF button to "OFF"
and back to "ON". If the unit starts to operate change the vacuum switch.
 Check the exhaust temperature switch (located on the exhaust blower) by shorting out the exhaust
temperature switch then depress ON/OFF button to "OFF" and back to "ON". If the unit starts to
operate change the exhaust temperature switch.
Exhaust blower does not operate normally.
 Check all wiring connections.
 Apply 120 volts directly to the exhaust blower. If the blower does not run replace the blower.
Circulation blower does not operate normally.
 Check all wiring connections
 Apply 120 volts directly to the circulation blower. If the blower does not run, replace the blower.
Igniter will not light fuel.
 Check electrical connections (including fuse) to the igniter
 Check that the igniter tube, which touches the burn pot, is not plugged with ash. If it is plugged
remove the debris (be sure to wait until everything has cooled to room temperature)
 Check to see that burn pot is installed correctly (see page 29)
 If igniter still does not work, replace it.
Note: The igniter should be glowing orange when in operation.
TROUBLE SHOOTING
See figure 26, page 31, for component locations
34
.