18
Problem
Humidifier will not heat
Humidifier will not fill
Humidifier will not stop
filling or is short cycling
Possible Cause
Blown heater fuse(s)
Control transformer not
producing 24 vac control
voltage
Safety controls open
(air flow switch, high
-
limit, etc.)
Over
-
temp switch
Faulty humidity sensor
Faulty immersion heater
No water pressure
Drain valve open
Fill valve stuck closed
Fill valve stuck open
Drain valve open
Recommended Action
Check and replace.
Check transformer output and verify voltage.
Verify that all safety controls are completing the
safety circuit.
The level control circuit has interference or is
damaged. Mineral on low water float switch
may be preventing the switch from opening on
low water condition. Consult factory if you are
unsure of the source of the problem.
Verify voltage to and from humidity sensor.
Check and verify heater voltage and amperage.
Compare to diagram or nameplate label
ratings.
Check water supply.
Close drain ball valve.
Check float valve seat for dirt.
Check float valve seat for dirt.
Adjust float ball arm.
Close drain ball valve.
Troubleshooting