Humidification System
21
69-2307—01
No. of
Red
Light
Blinks
Fault Description
Auto-
Recoverable?
Steps to Fix
To be Performed by Professional HVAC Technician Only
8–11
The backup weld
monitor input is active
when the backup
heater relay is off.
No
• Replace the unit.
12
Temperature of the
electronic circuit
board is too high.
Yes, system will
return to “Ready”
if fault no longer
exists in 1 hour.
• Ensure ventilation holes in the cover are clear of
obstruction, and that 1 foot of clearance is maintained
around the cover’s vent holes.
• Ensure the humidifier is installed in a location with
conditioned air 32°F (0°C) to 104°F (40°C).
• Turn humidistat off and allow time for electronic board to cool.
• Turn humidistat on and press RESET button.
• Confirm humidity call starts by HUMIDIFYING light turning on.
• Allow unit to run and check for steam leaks around tank and
ventilation holes.
• If steam is present, replace the humidifier.
13
Tank failed to drain.
No
• Water in tank may be hot (>140ºF [60ºC]).
• Press the EMPTY button.
• If unit fails to drain, wait for water in tank to cool. Ensure
tank water is cool before proceeding.
• Once cool, follow tank cleaning steps (pages 23–25).
• Reassemble tank and press the RESET button.
• If fault persists, replace the solenoid valve.
14
Heater failed to boil
water.
Yes, system will
return to “Ready”
if fault no longer
exists in 1 hour.
• Follow tank cleaning steps (pages 23–25).
• Reassemble tank and press the RESET button.
• If fault returns, replace the heating element with the
applicable wattage replacement part.
15
No Airflow.
Yes
• Ensure Differential Pressure Switch is installed and wired
correctly. See the Wiring section for proper wiring.
• Ensure DIP switches are set correctly.
• If fault persists, replace AFS and/or unit.
TRoubleshooTIng
TRoubleshooTIng
