40
CRUV INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
LW series controller
Table 40-1:
CRUV troubleshooting guide (tap/softened water)
Problem
Module indicating lights
Possible cause
Recommended action
Full
Ready
water
Drain
Humidifi er 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, airfl ow switch, high limit humidistat, etc.
Faulty control board
Verify control voltage between terminals.
Probe head deterioration*
Replace probe head.
Humidifi er will
not fi ll
Off
Off
Off
No water pressure at valve
Check water supply/shut off valves.
Faulty water fi ll valve
Verify action of fi ll 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".
Humidifi er does not
stop fi lling
Off
Off
Off
Low fi ll 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 fi ll water conductivity, then consult factory.
Fill valve is stuck open
Check valve for foreign matter.
Drain valve not closed, fi ll valve
installed backward
Check for correct water fl ow through valve note arrow.
Off
Off
On
Auto-drain mode
10 minute must complete fi rst.
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
Confi rm 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,
airfl ow 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 fi rst two years of
operation.
MAINTENANCE
Troubleshooting:
