United States Stove Company 5520 - Manual (Page 20)

20
Trouble Shooting Guide
STOVE SHUTS OFF AND THE #3 LIGHT FLASHES
Possible Causes: Possible Remedies: (Unplug stove fi rst when possible)
1. The hopper is out of pellets. Refi ll the hopper.
2. The air damper is too far open for a low feed setting. If burning on the low setting, you may need to close the damper all the
way (push the knob in so it touches the side of the stove).
3. The burnpot is not pushed completely to the rear of the fi rebox. Make sure that the air intake collar on the burnpot is touching the rear
wall of the fi rebox.
4. The burnpot holes are blocked. Remove the burnpot and thoroughly clean it.
5. The air inlet, the interior chambers, or exhaust system has a partial
blockage. Follow all cleaning procedures in the maintenance section of the owner’s
manual.
6. The hopper safety switch has failed or hopper is open. When operating the unit, be sure the hopper lid is closed so that the hopper
safety switch will activate. Check the wires leading from the hopper safety
switch to the control panel and auger motor for secure connections. Use
a continuity tester to test the hopper safety switch; replace if necessary.
7. The auger shaft is jammed. Start by emptying the hopper. Then remove the auger motor by removing
the auger pin. Remove the auger shaft inspection plate in the hopper
so that you can see the auger shaft. Gently lift the auger shaft straight
up so that the end of the auger shaft comes up out of the bottom auger
bushing. Next, remove the two nuts that hold the top auger biscuit in.
Then rotate the bottom end of the auger shaft up towards you until you can
lift the shaft out of the stove. After you have removed the shaft, inspect
it for bent fl ights, burrs, or broken welds. Remove any foreign material
that might have caused the jam. Also, check the auger tube for signs of
damage such as burrs, rough spots, or grooves cut into the metal that
could have caused a jam.
8. The auger motor has failed. Remove the auger motor from the auger shaft and try to run the unit. If
the motor will turn the shaft is jammed on something. If the motor will
not turn, the motor is bad.
9. The Proof of Fire (POF) thermodisc has malfunctioned. Temporarily bypass the POF thermodisc by disconnecting the two brown
wires and connecting them with a short piece of wire. Then plug the stove
back in. If the stove comes on and works, you need to replace the POF
thermodisc. This is for testing only. DO NOT LEAVE THE THERMODISC
BYPASSED. Your blowers will never shut off and if the fi re went out, the
auger will continue to feed pellets until the hopper is empty if you leave
the POF thermodisc bypassed.
10. The high limit thermodisc has tripped or is defective. Wait for the stove to cool for about 30 - 45 minutes. Locate the High Limit
thermodisc and press the reset button on the back of it. If the heater will
not restart, check the thermodisc to see if it’s bad. To test if the thermodisc
is bad, you can bypass it as described previously for the POF thermodisc.
11. The fuse on the control board has blown. Remove the control board. On the back there is one fuse. If it appears
to be bad, replace it with a 5 Amp, 125 Volt fuse. Plug the stove back in
and try to run the unit.
12. The control board is not sending power to the POF thermodisc or
other auger system components.
There should be a 5-volt (approximately) current going to the POF
thermodisc after the stove has been on for 10 minutes.