October 13, 2015
7034-276E
27
MT. VERNON AE
With proper installation, operation, and maintenance your appliance will provide years of trouble-free service. If you do experience a prob-
lem, this troubleshooting guide will assist a qualifi ed service person in the diagnosis of a problem and the corrective action to be taken.
This troubleshooting guide can only be used by a qualifi ed service technician.
Error Message
Possible Cause
Corrective Action
Bad wall control or control board
3 wires have loose connections or installed wrong
Replace wall control or control board
Check connections
BAD TC DROP TUBE
(TC = Thermocouple)
Drop tube thermocouple is broken or leads are
reversed
Check connections
Replace thermocouple
BAD TC FIREPOT
(TC = Thermocouple)
Firepot thermocouple is broken or leads are reversed
Check connections
Replace thermocouple
SNAP DISC TRIPPED
Overheat sensor (snap disc) has tripped
Convection blower may need cleaning
Turn power off to appliance and manually reset
snap disc then turn power back on
Clean convection blower if needed
VACUUM SW ERROR
(SW = Switch)
Vacuum switch is bad
Vacuum hose is plugged/disconnected
Check connections. Bypass vacuum with jumper
wire, if runs, switch is bad. Replace switch
Check vacuum hose
COMB BLOWER JAMMED
Combustion blower is blocked/jammed
Remove blockage
Replace blower if necessary
Must unplug appliance to clear error
AUGER JAMMED
Auger jammed, feed motor bad
Pull the feed system and inspect
Clear jam and Press Retry
MISSED IGNITION
Igniter bad or poor harness connection
Out of fuel or fuel is bridging in hopper
Faulty fi repot thermocouple connection has shorted.
Ash plugging the igniter slot in the fi repot bottom and
clear the slot
Check connections, if OK replace igniter
Break up bridging pellets. Refi ll hopper
Replace the thermocouple
Press Retry
Use cleaning tool or a spoon to scrape ash
MIN FIREPOT TEMP
Out of fuel
Refi ll hopper
Add handful of pellets to fi repot to prime it
Press Retry
MAX DROP TUBE TEMP
Appliance in over-heat condition
Flame height set too high
Components may need cleaning
Confi rm setting matches burning fuel
Adjust fl ame height
Clean the fi rebox, heat exchanger, convection
blower, fi repot and ash pan
CONV BLOWER JAMMED
Convection blower blocked/jammed
Remove blockage
Replace blower if necessary
Must unplug appliance to clear error
CHECK ASHPAN
Auto-clean jammed
Auto-clean switch is bad
Linkage has become disconnected
If ashpan is empty, check for a jam. Use a screw
driver and fi rmly push in the fi repot fl oor holes and
fl ex spring and push toward home to release jam
Replace switch
Reconnect linkage
SCREEN GOES BLANK
Static discharge or nearby lightning or
Electric fast transients at the input mains
Wait 25 seconds and press any key to refresh the
screen.
Hopper lid not closed all the way
Switch is out of adjustment (auger will not function)
Close the lid. If that didn’t work replace the switch
Adjust or replace switch
Firebox door is not latched properly
Adjust or replace door switch
Out of fuel
Check the fuel level, if OK the switch may be out,
replace switch
5
Troubleshooting Guide
