10
CRU
®
V TROUBLE-SHOOTING GUIDE
(LW415 Electronic Water Level System Only)*
CONTROL PANEL
LIGHTS
PROBLEM FILL READY
DRAIN POSSIBLE CAUSE
RECOMMENDED ACTION
WATER
Humidifier will
Off
Off
Off
Control transformer
Verify control voltage across secondary
not heat
leads of transformer. Reset transformer
circuit breaker. T1 and T2
Off
On
Off
Humidistat is not calling
Set humidistat to call. Inspect for faulty
humidistat.
Safety controls open
Check safety controls, air flow switch, high
limit humidistat, etc.
Faulty control board
Verify control voltage between terminals.
Probe head deterioration**
Replace probe head.
Humidifier will
On
Off
Off
No water pressure at valve.
Check water supply/shut off valves.
not fill
Faulty water fill valve
Verify action of fill water solenoid valve by
turning control module switch from standby
to normal op. Audible click should be
heard as solenoid operates.
Plugged strainer
Check strainer.
Plugged valve
Check valve.
Faulty control board
Verify control voltage across terminals
H & N.
Humidifier does
On
Off
Off
Lack of tank to probes
Jumper wires brown to yellow. If water
not stop filling
electrical continuity. Water
stops, verify tank ground; check water
conductivity 100
supply conductivity; then consult factory.
micromhos/cm (2 gr/gal) min.
Fill valve is stuck open
Check valve for foreign matter.
Drain Valve not closed
Check for correct water flow through valve
Fill valve installed backward
note arrow.
On
Off
On
Auto-drain mode
10 Minute must complete first.
Low output
Off
On
Off
Electric drain valve not
Correct cause of leakage or replace valve.
seating
Off
On
Off
Fill valve is stuck open
Check valve for foreign matter.
Unit short cycles On & Off
On
Off
Probes may be incorrectly
Confirm that unit is wired per diagram.
wired or need cleaning
Clean probe rod tips with steel wool.
Reduced or no
Off
On
Off
Heater malfunctioning
Verify that proper voltage is being applied to
output even
heaters. Check heater (amp draw and
though water
compare to wiring diagram ratings).
is at the proper
level
Malfunctioning control
Heater contactor not functioning--replace.
system
Service fuses blown. Auxiliary limit controls
not allowing system to operate (dust humidi-
stat, air flow proving switch, etc.). Reset,
replace or calibrate as required. Faulty or
inaccurate humidistat, replace or calibrate.
*For VAPOR-LOGIC
2
trouble-shooting, see the VAPOR-LOGIC
2
Operations and Maintenance Manual.
**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.
