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USSC 23
Display Indicators
Several situations or events are indicated in normal operation by blinking display indicators or segments in the display:
Flashing On Indicator: This means that the heater is in the “Start Up” awaiting for the ignition procedure to complete.
Flashing Off Indicator: This indicates that the heater is in the “Shutdown” state waiting for the OFF button, or for a 15 minute period
after the heater was turned off, or for the heater to cool down, or for the door to be closed.
Flashing dash in Heat Range Display: This indicates that the heater is in the normal run mode and is ramping from the current
heat range setting to the target heat range setting. Once the ramp is complete, the dash will stop ashing. For ramping from heat
range 1 to 5, the default time is 12 minutes (with a 90 second ramp time).
Flashing heat range value in “Heat Range” display: For example, if the display is showing “Hr-3” and the ‘3’ is blinking, this indi-
cates that the heater thermostat input is open and not calling for heat. While this is happening, the actual heat range value is 1 (low).
Flashing Automatic Mode Indicator: This indicates that the heater is in normal operation and is running in the automatic mode.
However, either the Draft Fan or Auxiliary setting is manually congured.
Flashing Draft Fan Setting Indicator: This indicates that the heater is in normal operation and that the vacuum sensor detects a
loss of pressure either because the door is open or because there is a negative pressure in the room with respect to the exhaust.
Flashing Aux Indicator: This indicates that the igniter is on during the lighting stage.
Quick (changes twice per second) Flashing Heat Range Setting Indicator : This indicates that the heater is in normal operation
and that an over temperature condition exists causing the fuel to stop.
Slow (changes once per second) Flashing Heat Range Setting Indicator : This indicates that the heater is in a cutback condition
in an attempt to prevent an over temperature shutdown.
Factory Defaults
To return the control to its original factory default settings, press and hold the AUX UP and AUX DOWN buttons together for three
seconds.
ERROR CODES and DISPLAY INDICATORS
Error
Code
Error
Description
Possible
Causes
Err1
The high limit temperature sensor
has tripped.
• Inadequate ventilation.
• Room fan failure.
• Exhaust Blockage.
• Electrical Open in the over temperature switch or wiring.
Err2
The low limit temperature sensor
has tripped.
• Hopper Empty.
• Auger output failure or jam.
• Poor ame or fuel quality caused re to burn too slowly or go out.
• Electrical Open in low temperature switch or wiring.
• Fire was not well established before the PCB’s programmed time
limit expired.
Err3
The heater was unable to reach the
Room Fan On temperature within the
startup time.
• Poor ame or fuel quality caused re to burn too slowly or go out.
• Auger output failure or jam Hopper empty on startup.
Err4
The power failed while the heater
was hot, and when power was re-
stored, the re was out.
• Electrical Open in low temperature switch or wiring.
• Power loss
Err5
The Auger output fuse has blown.
• Auger motor jammed or bad.
Err6
The Agitator output fuse has blown.
• Agitator motor jammed or bad.
Err7
The Draft Fan (Exhaust Fan) output
fuse has blown.
• Draft Fan motor jammed or bad.
Err8
The Room Fan output fuse has
blown.
• Room fan motor jammed or bad.
Err9
Zero Crossing Input failed
• AC supply frequency out of range.
Err10
The Igniter output fuse has blown
• Igniter output has shorted/blown or igniter overload.