Pure Humidifier ERDDR Series, Installation Instructions, Operation And Maintenance Manual

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15
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
(airflow switch, high - limit, etc.)
Over - temp switch
Faulty humidity sensor
Faulty immersion heater
No water pressure
Drain valve open
Faulty water float valve
Fill valve stuck open
Drain valve open
Recommended Action
Check and replace.
Check transformer output.
Verify voltage across terminals #9 (hot) and #10
(comm).
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.
Check float ball for leaks.
Close drain ball valve.