Specifications

Page 40 • DRI-STEEM CRUV Electric Humidifier Installation, Operation, and Maintenance Manual
Troubleshooting:
LW series controller
Table 40-1:
CRUV troubleshooting guide (tap/softened water)
Problem
Module indicating
lights
Possible cause Recommended action
Full
Ready
water
Drain
Humidifier will not
heat
Off Off Off Control transformer
Verify control voltage across secondary leads of transformer. Reset
transformer circuit breaker.
On On Off
Humidistat is not calling Set humidistat to call. Inspect for faulty humidistat.
Safety controls open Check safety controls, airflow switch, high limit humidistat, etc.
Faulty control board Verify control voltage between terminals.
Probe head deterioration* Replace probe head.
Humidifier will
not fill
Off Off Off
No water pressure at valve Check water supply/shut off valves.
Faulty water fill valve
Verify action of fill water solenoid valve by turning control module switch
from standby to normal operation. Audible click should be heard as solenoid
operates.
Plugged strainer Check strainer.
Plugged valve Check valve.
Faulty control board Verify control voltage across input terminals "B&W".
Humidifier does not
stop filling
Off Off Off
Low fill water conductivity. Water
conductivity must be at least
30 μS/cm.
Jumper wires violet, orange then brown to ground. If water stops, verify
tank ground, check fill water conductivity, then consult factory.
Fill valve is stuck open Check valve for foreign matter.
Drain valve not closed, fill valve
installed backward
Check for correct water flow through valve note arrow.
Off Off On Auto-drain mode 10 minute must complete first.
Low output
On On Off Electric drain valve not seating Correct cause of leakage or replace valve.
On On Off Fill valve is stuck open Check valve for foreign matter.
Unit short cycles
On &
Off
On Off Probes may be incorrectly wired Confirm that unit is wired per diagram. Clean probe rod tips with steel wool.
Reduced or no
output even though
water is at the
proper level
On On Off
Heater malfunctioning
Verify that proper voltage is being applied to heaters. Check heater (amp
draw and compare to wiring diagram ratings).
Malfunctioning control system
Heater contactor not functioning - replace. Service fuses blown. Auxiliary
limit controls not allowing system to operate (duct humidistat, airflow
proving switch, etc.). Reset, replace or calibrate as required. Faulty or
inaccurate humidistat, replace or calibrate.
* Probe rod corrosion or probe head material aging may cause level control system failure. This generally does not occur in the first two years of operation.
Maintenance