18
Troubleshooting
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
No power to the fill valve
Fill valve stuck open
Drain valve open
Probes need cleaning
Check probe wiring
Line noise or radio frequency
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. Tri-probe Sensor wires should be run
separate from power wiring. Do not reset the
switch until the source of the problem is identified
and corrected. 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.
If auto drain system is utilized, verify that the
manual drain lever on the front of the drain valve is
closed.
Check for 24 vac across solenoid valve.
Check for 24 vac across solenoid valve. If no
voltage, check for dirt under valve seat.
Close drain ball valve.
If auto drain system is utilized, verify that the
manual drain lever on the front of the drain valve is
closed.
Remove Tri-Probe Sensor and clean probe ends.
Grey wire to probe #1 (shortest probe)
Violet wire to probe #2 (middle probe)
Blue wire to probe #3 (longest probe)
Shielded cable may be necessary.
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